diff --git a/sys/amd64/amd64/pmap.c b/sys/amd64/amd64/pmap.c
index 0be5e29dd3f..a50306930cc 100644
--- a/sys/amd64/amd64/pmap.c
+++ b/sys/amd64/amd64/pmap.c
@@ -152,7 +152,7 @@ __FBSDID("$FreeBSD$");
 
 #if !defined(DIAGNOSTIC)
 #ifdef __GNUC_GNU_INLINE__
-#define PMAP_INLINE	inline
+#define PMAP_INLINE	__attribute__((__gnu_inline__)) inline
 #else
 #define PMAP_INLINE	extern inline
 #endif
diff --git a/sys/i386/i386/pmap.c b/sys/i386/i386/pmap.c
index f448071ef22..98b61519c61 100644
--- a/sys/i386/i386/pmap.c
+++ b/sys/i386/i386/pmap.c
@@ -163,7 +163,7 @@ __FBSDID("$FreeBSD$");
 
 #if !defined(DIAGNOSTIC)
 #ifdef __GNUC_GNU_INLINE__
-#define PMAP_INLINE	inline
+#define PMAP_INLINE	__attribute__((__gnu_inline__)) inline
 #else
 #define PMAP_INLINE	extern inline
 #endif