diff --git a/kitty_tests/keys.py b/kitty_tests/keys.py
index bc01cfc8c..c7a6f32c6 100644
--- a/kitty_tests/keys.py
+++ b/kitty_tests/keys.py
@@ -392,6 +392,7 @@ class TestKeys(BaseTest):
         # }}}
 
         ae(enc(key=ord(':'), shifted_key=ord('/'), mods=shift | alt), '\x1b/')
+        ae(enc(key=ord(':'), mods=alt), '\x1b:')
         ae(enc(key=ord(' ')), ' ')
         ae(enc(key=ord(' '), mods=ctrl), '\0')
         ae(enc(key=ord(' '), mods=alt), '\x1b ')