diff --git a/sys/compat/ndis/winx32_wrap.S b/sys/compat/ndis/winx32_wrap.S
index 9a6b3cdf580..065d409f0b5 100644
--- a/sys/compat/ndis/winx32_wrap.S
+++ b/sys/compat/ndis/winx32_wrap.S
@@ -32,6 +32,11 @@
  * $FreeBSD$
  */
 
+/* The 'ret' macro doesn't work in this file if GPROF is enabled. */
+#ifdef GPROF
+#undef GPROF
+#endif
+
 #include <machine/asmacros.h>
 
 /*