diff --git a/mock/mock.go b/mock/mock.go
index 727abd622..3a076e1ea 100644
--- a/mock/mock.go
+++ b/mock/mock.go
@@ -592,10 +592,8 @@ func AssertExpectationsForObjects(t TestingT, testObjects ...interface{}) bool {
 // AssertExpectations asserts that everything specified with On and Return was
 // in fact called as expected.  Calls may have occurred in any order.
 func (m *Mock) AssertExpectations(t TestingT) bool {
-	if s, ok := t.(tSkipped); ok {
-		if s.Skipped() {
-			return true
-		}
+	if s, ok := t.(interface{ Skipped() bool }); ok && s.Skipped() {
+		return true
 	}
 	if h, ok := t.(tHelper); ok {
 		h.Helper()
@@ -1168,10 +1166,6 @@ type tHelper interface {
 	Helper()
 }
 
-type tSkipped interface {
-	Skipped() bool
-}
-
 func assertOpts(expected, actual interface{}) (expectedFmt, actualFmt string) {
 	expectedOpts := reflect.ValueOf(expected)
 	actualOpts := reflect.ValueOf(actual)