diff --git a/src/ubuntu/install/gtk/install_restricted_file_chooser.sh b/src/ubuntu/install/gtk/install_restricted_file_chooser.sh
index 7af6a8c..0543205 100755
--- a/src/ubuntu/install/gtk/install_restricted_file_chooser.sh
+++ b/src/ubuntu/install/gtk/install_restricted_file_chooser.sh
@@ -5,5 +5,5 @@ set -e
 libgtk_deb=libgtk.deb
 
 wget https://kasmweb-build-artifacts.s3.amazonaws.com/kasm-gtk-3-restricted-file-chooser/de486e8c3c5f3d3c0f898fb9d6e05755897b1970/output/libgtk-3-0_3.22.30-1ubuntu4_amd64.deb -O $libgtk_deb
-apt-get install -y --allow-downgrades ./$libgtk_deb
+apt-get install -y --allow-downgrades ./"$libgtk_deb"
 rm "$libgtk_deb"