diff --git a/include/cpu_features_macros.h b/include/cpu_features_macros.h
index a8d4229..055a15e 100644
--- a/include/cpu_features_macros.h
+++ b/include/cpu_features_macros.h
@@ -12,8 +12,8 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-#ifndef THIRD_PARTY_CPU_FEATURES_INCLUDE_CPU_FEATURES_MACROS_H_
-#define THIRD_PARTY_CPU_FEATURES_INCLUDE_CPU_FEATURES_MACROS_H_
+#ifndef CPU_FEATURES_INCLUDE_CPU_FEATURES_MACROS_H_
+#define CPU_FEATURES_INCLUDE_CPU_FEATURES_MACROS_H_
 
 ////////////////////////////////////////////////////////////////////////////////
 // Architectures
@@ -118,4 +118,4 @@
 #define CPU_FEATURES_COMPILED_MIPS_MSA defined(__mips_msa)
 #endif
 
-#endif  // THIRD_PARTY_CPU_FEATURES_INCLUDE_CPU_FEATURES_MACROS_H_
+#endif  // CPU_FEATURES_INCLUDE_CPU_FEATURES_MACROS_H_
diff --git a/include/cpuinfo_aarch64.h b/include/cpuinfo_aarch64.h
index 3948153..c9d87d7 100644
--- a/include/cpuinfo_aarch64.h
+++ b/include/cpuinfo_aarch64.h
@@ -12,8 +12,8 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-#ifndef THIRD_PARTY_CPU_FEATURES_INCLUDE_CPUINFO_AARCH64_H_
-#define THIRD_PARTY_CPU_FEATURES_INCLUDE_CPUINFO_AARCH64_H_
+#ifndef CPU_FEATURES_INCLUDE_CPUINFO_AARCH64_H_
+#define CPU_FEATURES_INCLUDE_CPUINFO_AARCH64_H_
 
 #include "cpu_features_macros.h"
 
@@ -62,4 +62,4 @@ const char* GetAarch64FeaturesEnumName(Aarch64FeaturesEnum);
 
 END_CPP_NAMESPACE
 
-#endif  // THIRD_PARTY_CPU_FEATURES_INCLUDE_CPUINFO_AARCH64_H_
+#endif  // CPU_FEATURES_INCLUDE_CPUINFO_AARCH64_H_
diff --git a/include/cpuinfo_arm.h b/include/cpuinfo_arm.h
index cc7e2d9..d885b70 100644
--- a/include/cpuinfo_arm.h
+++ b/include/cpuinfo_arm.h
@@ -12,8 +12,8 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-#ifndef THIRD_PARTY_CPU_FEATURES_INCLUDE_CPUINFO_ARM_H_
-#define THIRD_PARTY_CPU_FEATURES_INCLUDE_CPUINFO_ARM_H_
+#ifndef CPU_FEATURES_INCLUDE_CPUINFO_ARM_H_
+#define CPU_FEATURES_INCLUDE_CPUINFO_ARM_H_
 
 #include "cpu_features_macros.h"
 
@@ -77,4 +77,4 @@ const char* GetArmFeaturesEnumName(ArmFeaturesEnum);
 
 END_CPP_NAMESPACE
 
-#endif  // THIRD_PARTY_CPU_FEATURES_INCLUDE_CPUINFO_ARM_H_
+#endif  // CPU_FEATURES_INCLUDE_CPUINFO_ARM_H_
diff --git a/include/cpuinfo_mips.h b/include/cpuinfo_mips.h
index bcece1e..2b9bd4d 100644
--- a/include/cpuinfo_mips.h
+++ b/include/cpuinfo_mips.h
@@ -12,8 +12,8 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-#ifndef THIRD_PARTY_CPU_FEATURES_INCLUDE_CPUINFO_MIPS_H_
-#define THIRD_PARTY_CPU_FEATURES_INCLUDE_CPUINFO_MIPS_H_
+#ifndef CPU_FEATURES_INCLUDE_CPUINFO_MIPS_H_
+#define CPU_FEATURES_INCLUDE_CPUINFO_MIPS_H_
 
 #include "cpu_features_macros.h"
 
@@ -50,4 +50,4 @@ const char* GetMipsFeaturesEnumName(MipsFeaturesEnum);
 
 END_CPP_NAMESPACE
 
-#endif  // THIRD_PARTY_CPU_FEATURES_INCLUDE_CPUINFO_MIPS_H_
+#endif  // CPU_FEATURES_INCLUDE_CPUINFO_MIPS_H_
diff --git a/include/cpuinfo_x86.h b/include/cpuinfo_x86.h
index bad8e4d..6baf04b 100644
--- a/include/cpuinfo_x86.h
+++ b/include/cpuinfo_x86.h
@@ -12,8 +12,8 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-#ifndef THIRD_PARTY_CPU_FEATURES_INCLUDE_CPUINFO_X86_H_
-#define THIRD_PARTY_CPU_FEATURES_INCLUDE_CPUINFO_X86_H_
+#ifndef CPU_FEATURES_INCLUDE_CPUINFO_X86_H_
+#define CPU_FEATURES_INCLUDE_CPUINFO_X86_H_
 
 #include "cpu_features_macros.h"
 
@@ -144,4 +144,4 @@ const char* GetX86MicroarchitectureName(X86Microarchitecture);
 
 END_CPP_NAMESPACE
 
-#endif  // THIRD_PARTY_CPU_FEATURES_INCLUDE_CPUINFO_X86_H_
+#endif  // CPU_FEATURES_INCLUDE_CPUINFO_X86_H_
diff --git a/include/internal/bit_utils.h b/include/internal/bit_utils.h
index b2d42fe..a0e85c2 100644
--- a/include/internal/bit_utils.h
+++ b/include/internal/bit_utils.h
@@ -12,8 +12,8 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-#ifndef THIRD_PARTY_CPU_FEATURES_INCLUDE_INTERNAL_BIT_UTILS_H_
-#define THIRD_PARTY_CPU_FEATURES_INCLUDE_INTERNAL_BIT_UTILS_H_
+#ifndef CPU_FEATURES_INCLUDE_INTERNAL_BIT_UTILS_H_
+#define CPU_FEATURES_INCLUDE_INTERNAL_BIT_UTILS_H_
 
 #include <assert.h>
 #include <stdbool.h>
@@ -36,4 +36,4 @@ inline static uint32_t ExtractBitRange(uint32_t reg, uint32_t msb,
 
 END_CPP_NAMESPACE
 
-#endif  // THIRD_PARTY_CPU_FEATURES_INCLUDE_INTERNAL_BIT_UTILS_H_
+#endif  // CPU_FEATURES_INCLUDE_INTERNAL_BIT_UTILS_H_
diff --git a/include/internal/cpuid_x86.h b/include/internal/cpuid_x86.h
index dea1ffd..24adeb3 100644
--- a/include/internal/cpuid_x86.h
+++ b/include/internal/cpuid_x86.h
@@ -12,8 +12,8 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-#ifndef THIRD_PARTY_CPU_FEATURES_INCLUDE_INTERNAL_CPUID_X86_H_
-#define THIRD_PARTY_CPU_FEATURES_INCLUDE_INTERNAL_CPUID_X86_H_
+#ifndef CPU_FEATURES_INCLUDE_INTERNAL_CPUID_X86_H_
+#define CPU_FEATURES_INCLUDE_INTERNAL_CPUID_X86_H_
 
 #include <stdint.h>
 
@@ -34,4 +34,4 @@ uint32_t GetXCR0Eax(void);
 
 END_CPP_NAMESPACE
 
-#endif  // THIRD_PARTY_CPU_FEATURES_INCLUDE_INTERNAL_CPUID_X86_H_
+#endif  // CPU_FEATURES_INCLUDE_INTERNAL_CPUID_X86_H_
diff --git a/include/internal/filesystem.h b/include/internal/filesystem.h
index da4a789..a8056b6 100644
--- a/include/internal/filesystem.h
+++ b/include/internal/filesystem.h
@@ -14,8 +14,8 @@
 
 // An interface for the filesystem that allows mocking the filesystem in
 // unittests.
-#ifndef THIRD_PARTY_CPU_FEATURES_INCLUDE_INTERNAL_FILESYSTEM_H_
-#define THIRD_PARTY_CPU_FEATURES_INCLUDE_INTERNAL_FILESYSTEM_H_
+#ifndef CPU_FEATURES_INCLUDE_INTERNAL_FILESYSTEM_H_
+#define CPU_FEATURES_INCLUDE_INTERNAL_FILESYSTEM_H_
 
 #include <stddef.h>
 #include <stdint.h>
@@ -35,4 +35,4 @@ void CloseFile(int file_descriptor);
 
 END_CPP_NAMESPACE
 
-#endif  // THIRD_PARTY_CPU_FEATURES_INCLUDE_INTERNAL_FILESYSTEM_H_
+#endif  // CPU_FEATURES_INCLUDE_INTERNAL_FILESYSTEM_H_
diff --git a/include/internal/hwcaps.h b/include/internal/hwcaps.h
index e220b33..5f25f9d 100644
--- a/include/internal/hwcaps.h
+++ b/include/internal/hwcaps.h
@@ -14,8 +14,8 @@
 
 // Interface to retrieve hardware capabilities. It relies on Linux's getauxval
 // or `/proc/self/auxval` under the hood.
-#ifndef THIRD_PARTY_CPU_FEATURES_INCLUDE_INTERNAL_HWCAPS_H_
-#define THIRD_PARTY_CPU_FEATURES_INCLUDE_INTERNAL_HWCAPS_H_
+#ifndef CPU_FEATURES_INCLUDE_INTERNAL_HWCAPS_H_
+#define CPU_FEATURES_INCLUDE_INTERNAL_HWCAPS_H_
 
 #include <stdint.h>
 #include "cpu_features_macros.h"
@@ -70,4 +70,4 @@ HardwareCapabilities GetHardwareCapabilities(void);
 
 END_CPP_NAMESPACE
 
-#endif  // THIRD_PARTY_CPU_FEATURES_INCLUDE_INTERNAL_HWCAPS_H_
+#endif  // CPU_FEATURES_INCLUDE_INTERNAL_HWCAPS_H_
diff --git a/include/internal/linux_features_aggregator.h b/include/internal/linux_features_aggregator.h
index 5939565..a41c6e3 100644
--- a/include/internal/linux_features_aggregator.h
+++ b/include/internal/linux_features_aggregator.h
@@ -15,8 +15,8 @@
 // CapabilityConfig provides a way to map cpu features to hardware caps and
 // /proc/cpuinfo flags. We then provide functions to update capabilities from
 // either source.
-#ifndef THIRD_PARTY_CPU_FEATURES_INCLUDE_INTERNAL_LINUX_FEATURES_AGGREGATOR_H_
-#define THIRD_PARTY_CPU_FEATURES_INCLUDE_INTERNAL_LINUX_FEATURES_AGGREGATOR_H_
+#ifndef CPU_FEATURES_INCLUDE_INTERNAL_LINUX_FEATURES_AGGREGATOR_H_
+#define CPU_FEATURES_INCLUDE_INTERNAL_LINUX_FEATURES_AGGREGATOR_H_
 
 #include <ctype.h>
 #include <stdint.h>
@@ -55,4 +55,4 @@ void OverrideFromHwCaps(const size_t configs_size,
                         void* const features);
 
 END_CPP_NAMESPACE
-#endif  // THIRD_PARTY_CPU_FEATURES_INCLUDE_INTERNAL_LINUX_FEATURES_AGGREGATOR_H_
+#endif  // CPU_FEATURES_INCLUDE_INTERNAL_LINUX_FEATURES_AGGREGATOR_H_
diff --git a/include/internal/stack_line_reader.h b/include/internal/stack_line_reader.h
index 4fde348..affc28a 100644
--- a/include/internal/stack_line_reader.h
+++ b/include/internal/stack_line_reader.h
@@ -14,8 +14,8 @@
 
 // Reads a file line by line and stores the data on the stack. This allows
 // parsing files in one go without allocating.
-#ifndef THIRD_PARTY_CPU_FEATURES_INCLUDE_INTERNAL_STACK_LINE_READER_H_
-#define THIRD_PARTY_CPU_FEATURES_INCLUDE_INTERNAL_STACK_LINE_READER_H_
+#ifndef CPU_FEATURES_INCLUDE_INTERNAL_STACK_LINE_READER_H_
+#define CPU_FEATURES_INCLUDE_INTERNAL_STACK_LINE_READER_H_
 
 #include <stdbool.h>
 
@@ -46,4 +46,4 @@ LineResult StackLineReader_NextLine(StackLineReader* reader);
 
 END_CPP_NAMESPACE
 
-#endif  // THIRD_PARTY_CPU_FEATURES_INCLUDE_INTERNAL_STACK_LINE_READER_H_
+#endif  // CPU_FEATURES_INCLUDE_INTERNAL_STACK_LINE_READER_H_
diff --git a/include/internal/string_view.h b/include/internal/string_view.h
index a528ad4..6fbd442 100644
--- a/include/internal/string_view.h
+++ b/include/internal/string_view.h
@@ -13,8 +13,8 @@
 // limitations under the License.
 
 // A view over a piece of string. The view is not 0 terminated.
-#ifndef THIRD_PARTY_CPU_FEATURES_INCLUDE_INTERNAL_STRING_VIEW_H_
-#define THIRD_PARTY_CPU_FEATURES_INCLUDE_INTERNAL_STRING_VIEW_H_
+#ifndef CPU_FEATURES_INCLUDE_INTERNAL_STRING_VIEW_H_
+#define CPU_FEATURES_INCLUDE_INTERNAL_STRING_VIEW_H_
 
 #include <stdbool.h>
 #include <stddef.h>
@@ -98,4 +98,4 @@ bool GetAttributeKeyValue(const StringView line, StringView* key,
 
 END_CPP_NAMESPACE
 
-#endif  // THIRD_PARTY_CPU_FEATURES_INCLUDE_INTERNAL_STRING_VIEW_H_
+#endif  // CPU_FEATURES_INCLUDE_INTERNAL_STRING_VIEW_H_
diff --git a/test/filesystem_for_testing.h b/test/filesystem_for_testing.h
index 46b3a49..ca269e5 100644
--- a/test/filesystem_for_testing.h
+++ b/test/filesystem_for_testing.h
@@ -13,8 +13,8 @@
 // limitations under the License.
 
 // Implements a fake filesystem, useful for tests.
-#ifndef THIRD_PARTY_CPU_FEATURES_TEST_FILESYSTEM_FOR_TESTING_H_
-#define THIRD_PARTY_CPU_FEATURES_TEST_FILESYSTEM_FOR_TESTING_H_
+#ifndef CPU_FEATURES_TEST_FILESYSTEM_FOR_TESTING_H_
+#define CPU_FEATURES_TEST_FILESYSTEM_FOR_TESTING_H_
 
 #include <memory>
 #include <string>
@@ -58,4 +58,4 @@ FakeFilesystem& GetEmptyFilesystem();
 
 }  // namespace cpu_features
 
-#endif  // THIRD_PARTY_CPU_FEATURES_TEST_FILESYSTEM_FOR_TESTING_H_
+#endif  // CPU_FEATURES_TEST_FILESYSTEM_FOR_TESTING_H_
diff --git a/test/hwcaps_for_testing.h b/test/hwcaps_for_testing.h
index d7bf470..bd20957 100644
--- a/test/hwcaps_for_testing.h
+++ b/test/hwcaps_for_testing.h
@@ -12,8 +12,8 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-#ifndef THIRD_PARTY_CPU_FEATURES_TEST_HWCAPS_FOR_TESTING_H_
-#define THIRD_PARTY_CPU_FEATURES_TEST_HWCAPS_FOR_TESTING_H_
+#ifndef CPU_FEATURES_TEST_HWCAPS_FOR_TESTING_H_
+#define CPU_FEATURES_TEST_HWCAPS_FOR_TESTING_H_
 
 #include "internal/hwcaps.h"
 
@@ -23,4 +23,4 @@ void SetHardwareCapabilities(uint32_t hwcaps, uint32_t hwcaps2);
 
 }  // namespace cpu_features
 
-#endif  // THIRD_PARTY_CPU_FEATURES_TEST_HWCAPS_FOR_TESTING_H_
+#endif  // CPU_FEATURES_TEST_HWCAPS_FOR_TESTING_H_