diff --git a/lib/SchemaBuilder.js b/lib/SchemaBuilder.js
index 5b50a71..6c2155a 100644
--- a/lib/SchemaBuilder.js
+++ b/lib/SchemaBuilder.js
@@ -153,7 +153,7 @@ class SchemaBuilder {
 
     if (this.subscription) {
       if (this.subscription instanceof Function) {
-        schemaSetup.subscription = this.mutation(this);
+        schemaSetup.subscription = this.subscription(this);
       } else {
         schemaSetup.subscription = this.subscription;
       }