diff --git a/src/main/java/com/trickl/assertj/core/api/json/AbstractObjectAssert.java b/src/main/java/com/trickl/assertj/core/api/json/AbstractObjectAssert.java
index c53e083..3292d74 100644
--- a/src/main/java/com/trickl/assertj/core/api/json/AbstractObjectAssert.java
+++ b/src/main/java/com/trickl/assertj/core/api/json/AbstractObjectAssert.java
@@ -82,7 +82,7 @@ public S jsonSchemaAsExpected() throws IOException {
     }
       
     JsonSchema jsonSchema = jsonSchema(actual);
-    String jsonString = jsonSchema.toString();
+    String jsonString = objectMapper.writeValueAsString(jsonSchema);
     com.trickl.assertj.core.api.Assertions.assertThat(json(jsonString))
         .allowingAnyArrayOrdering()
         .writeActualToFileOnFailure()