diff --git a/amd64/fenv.c b/amd64/fenv.c
index cba1b5c..ecd0ab2 100644
--- a/amd64/fenv.c
+++ b/amd64/fenv.c
@@ -29,7 +29,9 @@
 #include "bsd_fpu.h"
 #include "math_private.h"
 
-#define _fenv_static
+#ifdef _WIN32
+#define __fenv_static
+#endif
 #include "fenv.h"
 
 #ifdef __GNUC_GNU_INLINE__