diff --git a/src/common/cityhash.cpp b/src/common/cityhash.cpp
index 596b943e76..d6f599a29d 100644
--- a/src/common/cityhash.cpp
+++ b/src/common/cityhash.cpp
@@ -179,7 +179,7 @@ static uint64 HashLen0to16(const char* s, size_t len) {
         uint8 b = s[len >> 1];
         uint8 c = s[len - 1];
         uint32 y = static_cast<uint32>(a) + (static_cast<uint32>(b) << 8);
-        uint32 z = len + (static_cast<uint32>(c) << 2);
+        uint32 z = static_cast<uint32>(len) + (static_cast<uint32>(c) << 2);
         return ShiftMix(y * k2 ^ z * k0) * k2;
     }
     return k2;
@@ -290,7 +290,7 @@ static uint128 CityMurmur(const char* s, size_t len, uint128 seed) {
     uint64 b = Uint128High64(seed);
     uint64 c = 0;
     uint64 d = 0;
-    signed long l = len - 16;
+    signed long l = static_cast<long>(len) - 16;
     if (l <= 0) { // len <= 16
         a = ShiftMix(a * k1) * k1;
         c = b * k1 + HashLen0to16(s, len);