diff --git a/travis/setup-phpbb.sh b/travis/setup-phpbb.sh
index 205f23b876..8cb2f4cd68 100755
--- a/travis/setup-phpbb.sh
+++ b/travis/setup-phpbb.sh
@@ -37,5 +37,5 @@ then
 fi
 
 cd phpBB
-php ../composer.phar install --dev --no-interaction --prefer-source
+php ../composer.phar install --dev --no-interaction
 cd ..