diff --git a/src/Utils/FindBreakingChanges.php b/src/Utils/FindBreakingChanges.php
index 7864508..51134c4 100644
--- a/src/Utils/FindBreakingChanges.php
+++ b/src/Utils/FindBreakingChanges.php
@@ -116,7 +116,7 @@ class FindBreakingChanges
                 $newTypeKindName = self::typeKindName($newTypeDefinition);
                 $breakingChanges[] = [
                     'type' => self::BREAKING_CHANGE_TYPE_CHANGED,
-                    'description' => "${$typeName} changed from ${oldTypeKindName} to ${newTypeKindName}."
+                    'description' => "${typeName} changed from ${oldTypeKindName} to ${newTypeKindName}."
                 ];
             }
         }
diff --git a/tests/Utils/FindBreakingChangesTest.php b/tests/Utils/FindBreakingChangesTest.php
index cb0c220..e2cc9b2 100644
--- a/tests/Utils/FindBreakingChangesTest.php
+++ b/tests/Utils/FindBreakingChangesTest.php
@@ -5,8 +5,10 @@
 
 namespace GraphQL\Tests\Utils;
 
+use GraphQL\Type\Definition\InterfaceType;
 use GraphQL\Type\Definition\ObjectType;
 use GraphQL\Type\Definition\Type;
+use GraphQL\Type\Definition\UnionType;
 use GraphQL\Type\Schema;
 use GraphQL\Utils\FindBreakingChanges;
 
@@ -64,4 +66,49 @@ class FindBreakingChangesTest extends \PHPUnit_Framework_TestCase
         $this->assertEquals([], FindBreakingChanges::findRemovedTypes($oldSchema, $oldSchema));
     }
 
+    public function testShouldDetectTypeChanges()
+    {
+        $objectType = new ObjectType([
+            'name' => 'ObjectType',
+            'fields' => [
+                'field1' => ['type' => Type::string()],
+            ]
+        ]);
+
+        $interfaceType = new InterfaceType([
+            'name' => 'Type1',
+            'fields' => [
+                'field1' => ['type' => Type::string()]
+            ]
+        ]);
+
+        $unionType = new UnionType([
+            'name' => 'Type1',
+            'types' => [new ObjectType(['name' => 'blah'])],
+        ]);
+
+        $oldSchema = new Schema([
+            'query' => new ObjectType([
+                'name' => 'root',
+                'fields' => [
+                    'type1' => $interfaceType
+                ]
+            ])
+        ]);
+
+        $newSchema = new Schema([
+            'query' => new ObjectType([
+                'name' => 'root',
+                'fields' => [
+                    'type1' => $unionType
+                ]
+            ])
+        ]);
+
+        $this->assertEquals(
+            ['type' => FindBreakingChanges::BREAKING_CHANGE_TYPE_CHANGED, 'description' => 'Type1 changed from an Interface type to a Union type.'],
+            FindBreakingChanges::findTypesThatChangedKind($oldSchema, $newSchema)[0]
+        );
+    }
+
 }
\ No newline at end of file