diff --git a/src/murmurhash.c b/src/murmurhash.c
index 2edbf0e..c3eb8c3 100644
--- a/src/murmurhash.c
+++ b/src/murmurhash.c
@@ -69,8 +69,9 @@ murmurhash (const char *key, uint32_t len, uint32_t seed) {
   // remainder
   switch (len & 3) { // `len % 4'
     case 3: k ^= (tail[2] << 16);
+      // fallthrough
     case 2: k ^= (tail[1] << 8);
-
+      // fallthrough
     case 1:
       k ^= tail[0];
       k *= c1;