diff --git a/include/rapidjson/internal/diyfp.h b/include/rapidjson/internal/diyfp.h
index de3d1f0..033a2a2 100644
--- a/include/rapidjson/internal/diyfp.h
+++ b/include/rapidjson/internal/diyfp.h
@@ -19,12 +19,10 @@
 #ifndef RAPIDJSON_DIYFP_H_
 #define RAPIDJSON_DIYFP_H_
 
-#if defined(_MSC_VER)
+#if defined(_MSC_VER) && defined(_M_AMD64)
 #include <intrin.h>
-#if defined(_M_AMD64)
 #pragma intrinsic(_BitScanReverse64)
 #endif
-#endif
 
 RAPIDJSON_NAMESPACE_BEGIN
 namespace internal {