diff --git a/gcm.c b/gcm.c
index c95d1fb43b9cf24c530691dda3e8edcb339f3ff8..7b2e6057591993f25166ad16e87638426a62b7c7 100644
--- a/gcm.c
+++ b/gcm.c
@@ -366,7 +366,7 @@ gcm_hash(const struct gcm_key *key, union gcm_block *x,
 
 static void
 gcm_hash_sizes(const struct gcm_key *key, union gcm_block *x,
-		 uint64_t auth_size, uint64_t data_size)
+	       uint64_t auth_size, uint64_t data_size)
 {
   uint8_t buffer[GCM_BLOCK_SIZE];