diff --git a/setup.sh b/setup.sh
index e7483da..c88ee90 100644
--- a/setup.sh
+++ b/setup.sh
@@ -7,6 +7,13 @@ if [[ ! -h /app/skins ]]; then
     ln -s /var/lib/mediawiki/skins /app/skins
 fi
 
+if [[ ! -h /app/extensions ]]; then
+    mkdir -p /var/lib/mediawiki/extensions
+    cp -R /app/extensions/* /var/lib/mediawiki/extensions
+    rm -rf /app/extensions
+    ln -s /var/lib/mediawiki/extensions /app/extensions
+fi
+
 if [[ ! -h /app/images ]]; then
     mkdir -p /var/lib/mediawiki/images
     cp -R /app/images/* /var/lib/mediawiki/images