diff --git a/test/config_test.go b/test/config_test.go
index 078bac27..7c0571b0 100644
--- a/test/config_test.go
+++ b/test/config_test.go
@@ -112,7 +112,7 @@ func TestConfigureDocker(t *testing.T) {
 	helper.Stdout = &out
 	helper.Stderr = os.Stderr
 	if err = helper.Run(); err != nil {
-		t.Fatalf("Failed to execute `configure-docker --overwrite`: %v Stdout: %s", err, string(out.Bytes()))
+		t.Fatalf("Failed to execute `configure-docker --overwrite`: %v Stdout: %s", err, out.String())
 	}
 
 	dockerConfig, err = getDockerConfig()
@@ -156,7 +156,7 @@ func TestConfigureDocker_NonDefault(t *testing.T) {
 	helper.Stdout = &out
 	helper.Stderr = os.Stderr
 	if err = helper.Run(); err != nil {
-		t.Fatalf("Failed to execute `configure-docker --overwrite`: %v Stdout: %s", err, string(out.Bytes()))
+		t.Fatalf("Failed to execute `configure-docker --overwrite`: %v Stdout: %s", err, out.String())
 	}
 
 	dockerConfig, err = getDockerConfig()
diff --git a/test/e2e_test.go b/test/e2e_test.go
index bab98e7d..34fe8e95 100644
--- a/test/e2e_test.go
+++ b/test/e2e_test.go
@@ -114,7 +114,7 @@ func TestEndToEnd_GCRCreds(t *testing.T) {
 	helper.Stdout = &out
 	helper.Stdin = strings.NewReader(gcrRegistry)
 	if err = helper.Run(); err != nil {
-		t.Fatalf("`get` failed: %v, Stdout: %s", err, string(out.Bytes()))
+		t.Fatalf("`get` failed: %v, Stdout: %s", err, out.String())
 	}
 
 	// Verify the credentials