diff --git a/include/safetyhook/common.hpp b/include/safetyhook/common.hpp
index 808e85f..6ad9dd9 100644
--- a/include/safetyhook/common.hpp
+++ b/include/safetyhook/common.hpp
@@ -38,7 +38,7 @@
 #endif
 #endif
 
-#if defined(WIN32)
+#if defined(_WIN32)
 #define SAFETYHOOK_OS_WINDOWS 1
 #define SAFETYHOOK_OS_LINUX 0
 #elif defined(__linux__)
@@ -71,4 +71,4 @@
 #define SAFETYHOOK_NOINLINE __declspec(noinline)
 #elif SAFETYHOOK_COMPILER_GCC || SAFETYHOOK_COMPILER_CLANG
 #define SAFETYHOOK_NOINLINE __attribute__((noinline))
-#endif
\ No newline at end of file
+#endif