diff --git a/t/lib-httpd/apache.conf b/t/lib-httpd/apache.conf
index f667e7ce2f..9317ba0858 100644
--- a/t/lib-httpd/apache.conf
+++ b/t/lib-httpd/apache.conf
@@ -74,6 +74,7 @@ PassEnv GIT_VALGRIND_OPTIONS
 PassEnv GNUPGHOME
 PassEnv ASAN_OPTIONS
 PassEnv GIT_TRACE
+PassEnv GIT_CONFIG_NOSYSTEM
 
 Alias /dumb/ www/
 Alias /auth/dumb/ www/auth/dumb/