diff --git a/halfsiphash.c b/halfsiphash.c
index 3683ce2..d74d3be 100644
--- a/halfsiphash.c
+++ b/halfsiphash.c
@@ -83,7 +83,7 @@ int halfsiphash(const uint8_t *in, const size_t inlen, const uint8_t *k,
     uint32_t m;
     int i;
     const uint8_t *end = in + inlen - (inlen % sizeof(uint32_t));
-    const int left = inlen & 7;
+    const int left = inlen & 3;
     uint32_t b = ((uint32_t)inlen) << 24;
     v3 ^= k1;
     v2 ^= k0;