diff --git a/hugolib/hugo_sites_build_test.go b/hugolib/hugo_sites_build_test.go
index 5f3d1b9c0..0917817cc 100644
--- a/hugolib/hugo_sites_build_test.go
+++ b/hugolib/hugo_sites_build_test.go
@@ -392,7 +392,7 @@ func doTestMultiSitesBuild(t *testing.T, configTemplate, configSuffix string) {
 
 func TestMultiSitesRebuild(t *testing.T) {
 	// t.Parallel() not supported, see https://github.com/fortytw2/leaktest/issues/4
-	defer leaktest.CheckTimeout(t, 10*time.Second)()
+	defer leaktest.CheckTimeout(t, 20*time.Second)()
 
 	siteConfig := testSiteConfig{Fs: afero.NewMemMapFs(), DefaultContentLanguage: "fr", DefaultContentLanguageInSubdir: true}
 	sites := createMultiTestSites(t, siteConfig, multiSiteTOMLConfigTemplate)