diff --git a/pkg/appimage/appimagebuild b/pkg/appimage/appimagebuild
index 27989d9d92cbb4190a8b0a0854dea5b30ce38bec..38b3384854586193ed981b92eb60450708267caf 100755
--- a/pkg/appimage/appimagebuild
+++ b/pkg/appimage/appimagebuild
@@ -33,7 +33,7 @@ chmod 755 appimagetool
 
 # Only timestamp development branches
 if [ "${CI_COMMIT_REF_SLUG}" != "master" ]; then
-  PKGREL=dev-${CI_COMMIT_SHORT_SHA}-$(date +"%Y-%m-%d_%H-%M-%S")
+  PKGREL=dev-${CI_COMMIT_SHORT_SHA}-$(date +"%Y%m%d-%H%M%S")
 fi
 
 mv *-x86_64.AppImage ../${PKGNAME}-${PKGVER}-${PKGREL}-x86_64.AppImage