diff --git a/lib/SchemaBuilder.js b/lib/SchemaBuilder.js
index 32ac3af..1110c3e 100644
--- a/lib/SchemaBuilder.js
+++ b/lib/SchemaBuilder.js
@@ -162,7 +162,7 @@ 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;
       }