diff --git a/data/helpers.d/package b/data/helpers.d/package
index f28691579..f6c9c07db 100644
--- a/data/helpers.d/package
+++ b/data/helpers.d/package
@@ -124,6 +124,9 @@ ynh_install_app_dependencies () {
     	manifest_path="../settings/manifest.json"	# Into the restore script, the manifest is not at the same place
     fi
     version=$(grep '\"version\": ' "$manifest_path" | cut -d '"' -f 4)	# Retrieve the version number in the manifest file.
+    if [ " ${#version}" -eq 0 ]; then
+        version="1.0"
+    if
     dep_app=${app//_/-}	# Replace all '_' by '-'
 
     cat > /tmp/${dep_app}-ynh-deps.control << EOF	# Make a control file for equivs-build