diff --git a/config.pbtxt b/config.pbtxt
index 533d503..e2cc75e 100644
--- a/config.pbtxt
+++ b/config.pbtxt
@@ -10,7 +10,7 @@ input [
   {
     name: "text_input"
     data_type: TYPE_STRING
-    dims: [ -1 ]
+    dims: [ "-1" ]
 
 
   }