diff --git a/dnstraceroute.py b/dnstraceroute.py
index b1c37e9..01a1af5 100755
--- a/dnstraceroute.py
+++ b/dnstraceroute.py
@@ -120,9 +120,9 @@ def usage():
 
 def signal_handler(sig, frame):
     global shutdown
-    if should_stop:  # pressed twice, so exit immediately
+    if shutdown:  # pressed twice, so exit immediately
         exit(0)
-    should_stop = True  # pressed once, exit gracefully
+    shutdown = True  # pressed once, exit gracefully
 
 
 def expert_report(trace_path, color_mode):