diff --git a/tests/pexpects/disable_mouse.py b/tests/pexpects/disable_mouse.py
index 14e40f37a..191715b3d 100644
--- a/tests/pexpects/disable_mouse.py
+++ b/tests/pexpects/disable_mouse.py
@@ -22,10 +22,10 @@ sp.send("\x1b[TABCDEF")
 sp.expect_str("reader: Disabling mouse tracking")
 
 # Extended SGR sequences.
-sp.send("\x1b[<fooM")
+sp.send("\x1b[<1;2;3M")
 sp.expect_str("reader: Disabling mouse tracking")
 
-sp.send("\x1b[<foobarm")
+sp.send("\x1b[<1;2;3m")
 sp.expect_str("reader: Disabling mouse tracking")
 
 sp.sendline("echo done")