diff --git a/_packaging/appimage/Dockerfile b/_packaging/appimage/Dockerfile
index b912024f71..fe133f13f4 100644
--- a/_packaging/appimage/Dockerfile
+++ b/_packaging/appimage/Dockerfile
@@ -145,3 +145,6 @@ COPY jhbuildrc /root/.config/jhbuildrc
 RUN jhbuild build \
  && rm -r /root/.config \
  && rm -r /root/.cache
+
+# Environmental variable needed to run GTK for gsettings schema
+ENV XDG_DATA_DIRS="/root/jhbuild/install/share:/usr/share"