diff --git a/acinclude.m4 b/acinclude.m4
index a118bf1f..df8d8dc7 100644
--- a/acinclude.m4
+++ b/acinclude.m4
@@ -344,8 +344,10 @@ AH_BOTTOM([#if C_HAS_ATTRIBUTE
 
 AH_BOTTOM([#if C_HAS_BUILTIN_EXPECT
 #define GCC_UNLIKELY(x) __builtin_expect((x),0)
+#define GCC_LIKELY(X) __builtin_expect((x),1)
 #else
 #define GCC_UNLIKELY(x) (x)
+#define GCC_LIKELY(x) (x)
 #endif])
 
 AH_BOTTOM([
diff --git a/src/platform/visualc/config.h b/src/platform/visualc/config.h
index c96651bc..d49f10a7 100644
--- a/src/platform/visualc/config.h
+++ b/src/platform/visualc/config.h
@@ -54,6 +54,7 @@
 
 #define GCC_ATTRIBUTE(x) /* attribute not supported */
 #define GCC_UNLIKELY(x) (x)
+#define GCC_LIKELY(x) (x)
 
 #define INLINE __forceinline
 #define DB_FASTCALL __fastcall