diff --git a/src/main/java/uk/org/webcompere/modelassert/json/assertjson/AssertJson.java b/src/main/java/uk/org/webcompere/modelassert/json/assertjson/AssertJson.java
index 3de225c..17cf70a 100644
--- a/src/main/java/uk/org/webcompere/modelassert/json/assertjson/AssertJson.java
+++ b/src/main/java/uk/org/webcompere/modelassert/json/assertjson/AssertJson.java
@@ -31,7 +31,7 @@ public AssertJson<T> satisfies(Condition condition) {
         Result result = condition.test(converted);
         if (!result.isPassed()) {
             throw new AssertionFailedError("Expected: " + condition.describe() +
-                    "\n     but: " + result.getCondition() + " was " + result.getWas(),
+                    "\n     but:\n" + converted.toPrettyString() + "\nwas " + result.getWas(),
                     result.getCondition(), result.getWas());
         }
 
diff --git a/src/test/java/uk/org/webcompere/modelassert/json/JsonAssertionsTest.java b/src/test/java/uk/org/webcompere/modelassert/json/JsonAssertionsTest.java
index 84617e7..6776875 100644
--- a/src/test/java/uk/org/webcompere/modelassert/json/JsonAssertionsTest.java
+++ b/src/test/java/uk/org/webcompere/modelassert/json/JsonAssertionsTest.java
@@ -65,7 +65,7 @@ void jsonAtWithAssertJson() {
     void jsonAtWithAssertJsonNegative() {
         assertThatThrownBy(() -> assertJson("{\"name\":\"Bill\"}").at("/name").hasValue("Not Bill"))
                 .isInstanceOf(Error.class)
-                .hasMessage("Expected: Path at /name is equal to Not Bill\n     but: /name is equal to Not Bill was \"Bill\"");
+                .hasMessage("Expected: Path at /name is equal to Not Bill\n     but:\n{\n  \"name\" : \"Bill\"\n}\nwas \"Bill\"");
     }
 
     @Test
@@ -81,7 +81,7 @@ void jsonAtMultiWithAssertJsonNegative() {
                 .at("/name").hasValue("Bill")
                         .at("/age").hasValue(12))
                 .isInstanceOf(Error.class)
-                .hasMessage("Expected: Path at /age is equal to 12\n     but: /age is equal to 12 was 42");
+                .hasMessage("Expected: Path at /age is equal to 12\n     but:\n{\n  \"name\" : \"Bill\",\n  \"age\" : 42\n}\nwas 42");
     }
 
     @Test