diff --git a/lib/src/mock.dart b/lib/src/mock.dart
index 3d552ddd..8b1393de 100644
--- a/lib/src/mock.dart
+++ b/lib/src/mock.dart
@@ -706,17 +706,28 @@ _InOrderVerification get verifyInOrder {
   };
 }
 
+void _throwMockArgumentError(method) =>
+    throw new ArgumentError('$method must only be given a Mock object');
+
 void verifyNoMoreInteractions(var mock) {
-  var unverified = mock._realCalls.where((inv) => !inv.verified).toList();
-  if (unverified.isNotEmpty) {
-    fail("No more calls expected, but following found: " + unverified.join());
+  if (mock is Mock) {
+    var unverified = mock._realCalls.where((inv) => !inv.verified).toList();
+    if (unverified.isNotEmpty) {
+      fail("No more calls expected, but following found: " + unverified.join());
+    }
+  } else {
+    _throwMockArgumentError('verifyNoMoreInteractions');
   }
 }
 
 void verifyZeroInteractions(var mock) {
-  if (mock._realCalls.isNotEmpty) {
-    fail("No interaction expected, but following found: " +
-        mock._realCalls.join());
+  if (mock is Mock) {
+    if (mock._realCalls.isNotEmpty) {
+      fail("No interaction expected, but following found: " +
+          mock._realCalls.join());
+    }
+  } else {
+    _throwMockArgumentError('verifyZeroInteractions');
   }
 }
 
diff --git a/test/mockito_test.dart b/test/mockito_test.dart
index 4cc31bad..7802ea29 100644
--- a/test/mockito_test.dart
+++ b/test/mockito_test.dart
@@ -936,6 +936,11 @@ void main() {
       verify(mock.methodWithoutArgs());
       verifyNoMoreInteractions(mock);
     });
+
+    test("throws if given a real object", () {
+      expect(
+          () => verifyNoMoreInteractions(new RealClass()), throwsArgumentError);
+    });
   });
 
   group("verifyInOrder()", () {