diff --git a/builder/googlecompute/step_create_instance_test.go b/builder/googlecompute/step_create_instance_test.go
index c7272bea8..baae10849 100644
--- a/builder/googlecompute/step_create_instance_test.go
+++ b/builder/googlecompute/step_create_instance_test.go
@@ -39,7 +39,7 @@ func TestStepCreateInstance(t *testing.T) {
 		t.Fatal("should've deleted instance")
 	}
 	if driver.DeleteInstanceZone != config.Zone {
-		t.Fatal("bad zone: %#v", driver.DeleteInstanceZone)
+		t.Fatalf("bad zone: %#v", driver.DeleteInstanceZone)
 	}
 }
 
diff --git a/builder/googlecompute/step_teardown_instance_test.go b/builder/googlecompute/step_teardown_instance_test.go
index f007d5179..bd32ea26d 100644
--- a/builder/googlecompute/step_teardown_instance_test.go
+++ b/builder/googlecompute/step_teardown_instance_test.go
@@ -26,7 +26,7 @@ func TestStepTeardownInstance(t *testing.T) {
 		t.Fatal("should've deleted instance")
 	}
 	if driver.DeleteInstanceZone != config.Zone {
-		t.Fatal("bad zone: %#v", driver.DeleteInstanceZone)
+		t.Fatalf("bad zone: %#v", driver.DeleteInstanceZone)
 	}
 
 	// cleanup
@@ -36,6 +36,6 @@ func TestStepTeardownInstance(t *testing.T) {
 		t.Fatal("should've deleted disk")
 	}
 	if driver.DeleteDiskZone != config.Zone {
-		t.Fatal("bad zone: %#v", driver.DeleteDiskZone)
+		t.Fatalf("bad zone: %#v", driver.DeleteDiskZone)
 	}
 }