diff --git a/data/helpers.d/utils b/data/helpers.d/utils
index 3ab56747e..70643c64a 100644
--- a/data/helpers.d/utils
+++ b/data/helpers.d/utils
@@ -583,12 +583,12 @@ ynh_app_upstream_version () {
 
     if [[ "$manifest" != "" ]] && [[ -e "$manifest" ]];
     then
-      version_key=$(ynh_read_manifest --manifest="$manifest" --manifest_key="version")
+      version_key_=$(ynh_read_manifest --manifest="$manifest" --manifest_key="version")
     else
-      version_key=$YNH_APP_MANIFEST_VERSION
+      version_key_=$YNH_APP_MANIFEST_VERSION
     fi
 
-    echo "${version_key/~ynh*/}"
+    echo "${version_key_/~ynh*/}"
 }
 
 # Read package version from the manifest
@@ -611,8 +611,8 @@ ynh_app_package_version () {
     # Manage arguments with getopts
     ynh_handle_getopts_args "$@"
 
-    version_key=$YNH_APP_MANIFEST_VERSION
-    echo "${version_key/*~ynh/}"
+    version_key_=$YNH_APP_MANIFEST_VERSION
+    echo "${version_key_/*~ynh/}"
 }
 
 # Checks the app version to upgrade with the existing app version and returns: