diff --git a/include/internal/windows_utils.h b/include/internal/windows_utils.h
index 8e83e56..7e7cd7d 100644
--- a/include/internal/windows_utils.h
+++ b/include/internal/windows_utils.h
@@ -15,19 +15,24 @@
 #ifndef CPU_FEATURES_INCLUDE_INTERNAL_WINDOWS_UTILS_H_
 #define CPU_FEATURES_INCLUDE_INTERNAL_WINDOWS_UTILS_H_
 
+#include "cpu_features_macros.h"
+
+#ifdef CPU_FEATURES_OS_WINDOWS
+
 #include <windows.h>  // IsProcessorFeaturePresent
 
 // modern WinSDK winnt.h contains newer features detection definitions
 #if !defined(PF_SSSE3_INSTRUCTIONS_AVAILABLE)
-#define PF_SSSE3_INSTRUCTIONS_AVAILABLE             36
+#define PF_SSSE3_INSTRUCTIONS_AVAILABLE 36
 #endif
 
 #if !defined(PF_SSE4_1_INSTRUCTIONS_AVAILABLE)
-#define PF_SSE4_1_INSTRUCTIONS_AVAILABLE            37
+#define PF_SSE4_1_INSTRUCTIONS_AVAILABLE 37
 #endif
 
 #if !defined(PF_SSE4_2_INSTRUCTIONS_AVAILABLE)
-#define PF_SSE4_2_INSTRUCTIONS_AVAILABLE            38
+#define PF_SSE4_2_INSTRUCTIONS_AVAILABLE 38
 #endif
 
+#endif  // CPU_FEATURES_OS_WINDOWS
 #endif  // CPU_FEATURES_INCLUDE_INTERNAL_WINDOWS_UTILS_H_