diff --git a/gobreaker_test.go b/gobreaker_test.go
index ea81fef..3de0982 100644
--- a/gobreaker_test.go
+++ b/gobreaker_test.go
@@ -42,6 +42,6 @@ func TestBreaker(t *testing.T) {
 	}
 
 	if err.Error() != "circuit breaker is open" {
-		t.Error("Expecting tripped breaker, got %v", err)
+		t.Errorf("Expecting tripped breaker, got %v", err)
 	}
 }