diff --git a/City.cpp b/City.cpp
index f729ec32..d4aca86a 100644
--- a/City.cpp
+++ b/City.cpp
@@ -502,7 +502,7 @@ uint128 CityHash128(const char *s, size_t len) {
              : CityHash128WithSeed(s, len, uint128(k0, k1));
 }
 
-#ifdef __SSE4_2__
+#if defined(__SSE4_2__) && defined(__x86_64__)
 #include "CityCrc.h"
 #include <nmmintrin.h>