diff --git a/common/basetilehash_test.go b/common/basetilehash_test.go
index 8826fdd..b586278 100644
--- a/common/basetilehash_test.go
+++ b/common/basetilehash_test.go
@@ -54,7 +54,7 @@ func TestBaseTileHash(t *testing.T) {
 			if k != v.btKey {
 				if !already2 {
 					already2 = true
-					t.Error("Key in entry does not match hash key: %d", updates)
+					t.Errorf("Key in entry does not match hash key: %d", updates)
 				}
 			}
 			delete(entries, v)