diff --git a/src/nxt_clang.h b/src/nxt_clang.h
index 0ed55b64..6cb752dd 100644
--- a/src/nxt_clang.h
+++ b/src/nxt_clang.h
@@ -30,17 +30,25 @@ nxt_pragma_loop_disable_vectorization
 
 #if (NXT_HAVE_BUILTIN_EXPECT)
 
+#define                                                                       \
+nxt_expect(c, x)                                                              \
+    __builtin_expect((long) (x), (c))
+
 #define                                                                       \
 nxt_fast_path(x)                                                              \
-    __builtin_expect((long) (x), 1)
+    nxt_expect(1, x)
 
 #define                                                                       \
 nxt_slow_path(x)                                                              \
-    __builtin_expect((long) (x), 0)
+    nxt_expect(0, x)
 
 
 #else
 
+#define                                                                       \
+nxt_expect(c, x)                                                              \
+    (x)
+
 #define                                                                       \
 nxt_fast_path(x)                                                              \
     (x)