diff --git a/include/cglm/simd/x86.h b/include/cglm/simd/x86.h
index 9f8e110..5848b7b 100644
--- a/include/cglm/simd/x86.h
+++ b/include/cglm/simd/x86.h
@@ -198,7 +198,7 @@ glmm_store3(float v[3], __m128 vx) {
 }
 
 /* enable FMA macro for MSVC? */
-#if !defined(__FMA__) && defined(__AVX2__)
+#if defined(_MSC_VER) && !defined(__FMA__) && defined(__AVX2__)
 #  define __FMA__ 1
 #endif