--- a/python/mozbuild/mozbuild/test/configure/test_configure.py
+++ b/python/mozbuild/mozbuild/test/configure/test_configure.py
@@ -862,16 +862,27 @@ class TestConfigure(unittest.TestCase):
 
                 foo()
             '''):
                 self.get_config()
 
         self.assertEquals(e.exception.message,
                           "The `foo` function may not be called")
 
+        with self.assertRaises(TypeError) as e:
+            with self.moz_configure('''
+                @depends('--help', foo=42)
+                def foo(_):
+                    return
+            '''):
+                self.get_config()
+
+        self.assertEquals(e.exception.message,
+                          "depends_impl() got an unexpected keyword argument 'foo'")
+
     def test_imports_failures(self):
         with self.assertRaises(ConfigureError) as e:
             with self.moz_configure('''
                 @imports('os')
                 @template
                 def foo(value):
                     return value
             '''):