diff --git a/build_tools/pexpect_helper.py b/build_tools/pexpect_helper.py
index e8bb143e4..c553efef9 100644
--- a/build_tools/pexpect_helper.py
+++ b/build_tools/pexpect_helper.py
@@ -130,7 +130,7 @@ class Message(object):
         return Message(Message.DIR_OUTPUT, text, when)
 
 # Sequences for moving the cursor below the commandline. This happens before executing.
-MOVE_TO_END: str = r"(?:\r\n|\x1b\[2 q)"
+MOVE_TO_END: str = r"(?:\r\n|\x1b\[2 q|)"
 TO_END: str  = MOVE_TO_END + r"[^\n]*"
 TO_END_SUFFIX: str  = r"[^\n]*" + MOVE_TO_END