diff --git a/include/jemalloc/internal/hash.h b/include/jemalloc/internal/hash.h
index 9132b60c..7f945679 100644
--- a/include/jemalloc/internal/hash.h
+++ b/include/jemalloc/internal/hash.h
@@ -182,19 +182,19 @@ hash_x86_128(const void *key, const int len, uint32_t seed,
 		case 13: k4 ^= tail[12] << 0;
 			k4 *= c4; k4 = hash_rotl_32(k4, 18); k4 *= c1; h4 ^= k4;
 			JEMALLOC_FALLTHROUGH;
-		case 12: k3 ^= tail[11] << 24; JEMALLOC_FALLTHROUGH;
+		case 12: k3 ^= (uint32_t) tail[11] << 24; JEMALLOC_FALLTHROUGH;
 		case 11: k3 ^= tail[10] << 16; JEMALLOC_FALLTHROUGH;
 		case 10: k3 ^= tail[ 9] << 8; JEMALLOC_FALLTHROUGH;
 		case  9: k3 ^= tail[ 8] << 0;
 			k3 *= c3; k3 = hash_rotl_32(k3, 17); k3 *= c4; h3 ^= k3;
 			JEMALLOC_FALLTHROUGH;
-		case  8: k2 ^= tail[ 7] << 24; JEMALLOC_FALLTHROUGH;
+		case  8: k2 ^= (uint32_t) tail[ 7] << 24; JEMALLOC_FALLTHROUGH;
 		case  7: k2 ^= tail[ 6] << 16; JEMALLOC_FALLTHROUGH;
 		case  6: k2 ^= tail[ 5] << 8; JEMALLOC_FALLTHROUGH;
 		case  5: k2 ^= tail[ 4] << 0;
 			k2 *= c2; k2 = hash_rotl_32(k2, 16); k2 *= c3; h2 ^= k2;
 			JEMALLOC_FALLTHROUGH;
-		case  4: k1 ^= tail[ 3] << 24; JEMALLOC_FALLTHROUGH;
+		case  4: k1 ^= (uint32_t) tail[ 3] << 24; JEMALLOC_FALLTHROUGH;
 		case  3: k1 ^= tail[ 2] << 16; JEMALLOC_FALLTHROUGH;
 		case  2: k1 ^= tail[ 1] << 8; JEMALLOC_FALLTHROUGH;
 		case  1: k1 ^= tail[ 0] << 0;