diff --git a/rbd/diff_iterate_test.go b/rbd/diff_iterate_test.go
index 6a4019f..3b4ff46 100644
--- a/rbd/diff_iterate_test.go
+++ b/rbd/diff_iterate_test.go
@@ -335,8 +335,8 @@ func testDiffIterateEarlyExit(t *testing.T, ioctx *rados.IOContext) {
 			},
 		})
 	assert.Error(t, err)
-	if errno, ok := err.(interface{ Errno() int }); assert.True(t, ok) {
-		assert.EqualValues(t, -5, errno.Errno())
+	if errno, ok := err.(interface{ ErrorCode() int }); assert.True(t, ok) {
+		assert.EqualValues(t, -5, errno.ErrorCode())
 	}
 	if assert.Len(t, calls, 1) {
 		assert.EqualValues(t, 0, calls[0].offset)
diff --git a/rbd/errors.go b/rbd/errors.go
index 87a43b2..73336b7 100644
--- a/rbd/errors.go
+++ b/rbd/errors.go
@@ -23,7 +23,7 @@ func (e rbdError) Error() string {
 	return fmt.Sprintf("rbd: ret=%d, %s", errno, s)
 }
 
-func (e rbdError) Errno() int {
+func (e rbdError) ErrorCode() int {
 	return int(e)
 }
 
diff --git a/rbd/errors_test.go b/rbd/errors_test.go
index 1fc1065..d37ee43 100644
--- a/rbd/errors_test.go
+++ b/rbd/errors_test.go
@@ -15,10 +15,10 @@ func TestRBDError(t *testing.T) {
 	assert.Error(t, err)
 	assert.Equal(t, err.Error(), "rbd: ret=39, Directory not empty")
 
-	errno, ok := err.(interface{ Errno() int })
+	errno, ok := err.(interface{ ErrorCode() int })
 	assert.True(t, ok)
 	require.NotNil(t, errno)
-	assert.Equal(t, errno.Errno(), -39)
+	assert.Equal(t, errno.ErrorCode(), -39)
 
 	err = getError(345) // no such errno
 	assert.Error(t, err)