diff --git a/potx.inc b/potx.inc
index f3d3814..c50727a 100644
--- a/potx.inc
+++ b/potx.inc
@@ -637,6 +637,11 @@ function _potx_translation_export($translation_export_langcode, $string, $plural
             $output .= 'msgstr[' . $index . '] ' . _locale_export_string($translation);
           }
         }
+        else {
+          foreach (array_keys($strings) as $index) {
+            $output .= "msgstr[" . $index . "] \"\"\n";
+          }
+        }
       }
       else {
         foreach ($strings as $index => $string) {