diff --git a/src/copy.h b/src/copy.inl
similarity index 100%
rename from src/copy.h
rename to src/copy.inl
diff --git a/src/equals.h b/src/equals.inl
similarity index 100%
rename from src/equals.h
rename to src/equals.inl
diff --git a/src/impl_x86__base_implementation.inl b/src/impl_x86__base_implementation.inl
index 3a0326a..0ac6609 100644
--- a/src/impl_x86__base_implementation.inl
+++ b/src/impl_x86__base_implementation.inl
@@ -16,9 +16,9 @@
 #include <stdbool.h>
 #include <string.h>
 
-#include "copy.h"
+#include "copy.inl"
 #include "cpuinfo_x86.h"
-#include "equals.h"
+#include "equals.inl"
 #include "internal/bit_utils.h"
 #include "internal/cpuid_x86.h"
 
diff --git a/src/string_view.c b/src/string_view.c
index e05a8c5..2cac9da 100644
--- a/src/string_view.c
+++ b/src/string_view.c
@@ -17,8 +17,8 @@
 #include <assert.h>
 #include <ctype.h>
 
-#include "copy.h"
-#include "equals.h"
+#include "copy.inl"
+#include "equals.inl"
 
 static const char* CpuFeatures_memchr(const char* const ptr, const size_t size,
                                       const char c) {