diff --git a/BUILD.gn b/BUILD.gn
index b12450d71..cff6e0506 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -142,6 +142,7 @@ config("extra_warnings") {
   }
   if (is_clang) {
     cflags += [
+      "-Wbad-function-cast",
       "-Wconditional-uninitialized",
       "-Wextra-semi-stmt",
       "-Wfloat-conversion",
diff --git a/src/common/third_party/xxhash/xxhash.c b/src/common/third_party/xxhash/xxhash.c
index cf138bcbb..ae9a55116 100644
--- a/src/common/third_party/xxhash/xxhash.c
+++ b/src/common/third_party/xxhash/xxhash.c
@@ -222,7 +222,7 @@ static int XXH_isLittleEndian(void)
     const union { U32 u; BYTE c[4]; } one = { 1 };   /* don't use static : performance detrimental  */
     return one.c[0];
 }
-#   define XXH_CPU_LITTLE_ENDIAN   XXH_isLittleEndian()
+#   define XXH_CPU_LITTLE_ENDIAN   (XXH_isLittleEndian())
 #endif