diff --git a/staging/src/k8s.io/apimachinery/pkg/api/apitesting/roundtrip/roundtrip.go b/staging/src/k8s.io/apimachinery/pkg/api/apitesting/roundtrip/roundtrip.go
index eb6c7cfa81c..54968948601 100644
--- a/staging/src/k8s.io/apimachinery/pkg/api/apitesting/roundtrip/roundtrip.go
+++ b/staging/src/k8s.io/apimachinery/pkg/api/apitesting/roundtrip/roundtrip.go
@@ -350,14 +350,14 @@ func roundTrip(t *testing.T, scheme *runtime.Scheme, codec runtime.Codec, object
 	// decode (deserialize) the encoded data back into an object
 	obj2, err := runtime.Decode(codec, data)
 	if err != nil {
-		t.Errorf("%v: %v\nCodec: %#v\nData: %s\nSource: %#v", name, err, codec, dataAsString(data), dump.Pretty(object))
+		t.Errorf("%v: %v\nCodec: %#v\nData: %s\nSource: %s", name, err, codec, dataAsString(data), dump.Pretty(object))
 		panic("failed")
 	}
 
 	// ensure that the object produced from decoding the encoded data is equal
 	// to the original object
 	if !apiequality.Semantic.DeepEqual(original, obj2) {
-		t.Errorf("%v: diff: %v\nCodec: %#v\nSource:\n\n%#v\n\nEncoded:\n\n%s\n\nFinal:\n\n%#v", name, cmp.Diff(original, obj2), codec, dump.Pretty(original), dataAsString(data), dump.Pretty(obj2))
+		t.Errorf("%v: diff: %v\nCodec: %#v\nSource:\n\n%s\n\nEncoded:\n\n%s\n\nFinal:\n\n%s", name, cmp.Diff(original, obj2), codec, dump.Pretty(original), dataAsString(data), dump.Pretty(obj2))
 		return
 	}