diff --git a/postproc/rgb2rgb.c b/postproc/rgb2rgb.c
index 4ddb7d769d..3417afe0a7 100644
--- a/postproc/rgb2rgb.c
+++ b/postproc/rgb2rgb.c
@@ -6,7 +6,7 @@
 #ifdef HAVE_3DNOW
 #define PREFETCH "prefetch"
 #define PREFETCHW "prefetchw"
-#elif HAVE_MMX2
+#elif defined ( HAVE_MMX2 )
 #define PREFETCH "prefetchnta"
 #define PREFETCHW "prefetcht0"
 #endif
diff --git a/postproc/rgb2rgb_template.c b/postproc/rgb2rgb_template.c
index 4ddb7d769d..3417afe0a7 100644
--- a/postproc/rgb2rgb_template.c
+++ b/postproc/rgb2rgb_template.c
@@ -6,7 +6,7 @@
 #ifdef HAVE_3DNOW
 #define PREFETCH "prefetch"
 #define PREFETCHW "prefetchw"
-#elif HAVE_MMX2
+#elif defined ( HAVE_MMX2 )
 #define PREFETCH "prefetchnta"
 #define PREFETCHW "prefetcht0"
 #endif