diff --git a/docker-files/bc-dev-debian9-appimage b/docker-files/bc-dev-debian9-appimage
index 8f2580841..68ba23b9a 100644
--- a/docker-files/bc-dev-debian9-appimage
+++ b/docker-files/bc-dev-debian9-appimage
@@ -1,3 +1,4 @@
+
 FROM gitlab.linphone.org:4567/bc/public/linphone-sdk/bc-dev-debian9:20230302_newer_clang_cpp17
 
 ARG QT_EMAIL