diff --git a/bin/test-with-real-projects.sh b/bin/test-with-real-projects.sh
index cb849e90b..1a4c65c73 100755
--- a/bin/test-with-real-projects.sh
+++ b/bin/test-with-real-projects.sh
@@ -26,7 +26,7 @@ collections)
 proxymanager)
 	git clone git@github.com:muglug/ProxyManager.git
 	cd ProxyManager
-	composer install
+	php -dextension=intl.so composer install
 	~/project/psalm --monochrome
 	;;