diff --git a/Tests/test_file_sgi.py b/Tests/test_file_sgi.py
index 7af9d0949..3201889d4 100644
--- a/Tests/test_file_sgi.py
+++ b/Tests/test_file_sgi.py
@@ -61,6 +61,13 @@ class TestFileSgi(PillowTestCase):
 
         self.assertRaises(ValueError, lambda: im.save(out, format='sgi'))
 
+    def test_incorrect_number_of_bands(self):
+        im = hopper('YCbCr')
+        im.mode = 'RGB'
+        out = self.tempfile('temp.sgi')
+
+        self.assertRaises(ValueError, lambda: im.save(out, format='sgi'))
+
 
 if __name__ == '__main__':
     unittest.main()