diff --git a/murmur3.c b/murmur3.c
index af9d1df..e35ebdb 100644
--- a/murmur3.c
+++ b/murmur3.c
@@ -23,7 +23,9 @@ uint32_t murmur3_32(const uint8_t* key, size_t len, uint32_t seed) {
     k = 0;
     switch (len & 3) {
         case 3: k ^= key[i + 2] << 16;
+        /* fall through */
         case 2: k ^= key[i + 1] << 8;
+        /* fall through */
         case 1: k ^= key[i + 0];
                 k *= c1; k = (k << 15) | (k >> (32 - 15)); k *= c2; h ^= k;
     }