diff --git a/t/lib-httpd/apache.conf b/t/lib-httpd/apache.conf
index eb44322b1..67b6db136 100644
--- a/t/lib-httpd/apache.conf
+++ b/t/lib-httpd/apache.conf
@@ -57,6 +57,9 @@ ErrorLog error.log
 <IfModule !mod_access_compat.c>
 	LoadModule access_compat_module modules/mod_access_compat.so
 </IfModule>
+<IfModule !mod_mpm_prefork.c>
+	LoadModule mpm_prefork_module modules/mod_mpm_prefork.so
+</IfModule>
 </IfVersion>
 
 PassEnv GIT_VALGRIND