diff --git a/sys/sys/cdefs.h b/sys/sys/cdefs.h
index cfd68e93fbb2..23e567cb8bd7 100644
--- a/sys/sys/cdefs.h
+++ b/sys/sys/cdefs.h
@@ -542,7 +542,7 @@
  * using these but GCC-compatible compilers tend to support the extensions
  * well enough to use them in limited cases.
  */ 
-#if __GNUC_PREREQ__(4, 1)
+#if defined(__GNUC_GNU_INLINE__) || defined(__GNUC_STDC_INLINE__)
 #if __has_attribute(artificial) || __GNUC_PREREQ__(4, 3)
 #define	__gnu_inline	__attribute__((__gnu_inline__, __artificial__))
 #else