diff --git a/tools/buildman/builder.py b/tools/buildman/builder.py
index c93946842a3..6f6d759329a 100644
--- a/tools/buildman/builder.py
+++ b/tools/buildman/builder.py
@@ -1691,7 +1691,7 @@ class Builder:
         term = threading.Thread(target=self.queue.join)
         term.setDaemon(True)
         term.start()
-        while term.isAlive():
+        while term.is_alive():
             term.join(100)
 
         # Wait until we have processed all output