diff --git a/scripts/upgrade b/scripts/upgrade
index 72047c3..5db8698 100755
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -49,7 +49,7 @@ ynh_script_progression --message="Upgrading source files..." --weight=60
 
 # Sort --version-sort cdécembrean handle underscore in versions numbers
 mapfile -t main_versions < <(
-    ynh_read_manifest --key="resources.sources | keys[]" | grep "main_" | sort --version-sort
+    ynh_read_manifest --manifest_key="resources.sources | keys[]" | grep "main_" | sort --version-sort
 )
 current_version="$YNH_APP_CURRENT_VERSION"
 for version in "${main_versions[@]}"; do