diff --git a/Lib/subprocess.py b/Lib/subprocess.py
index 68de777644e..1691c05b1f3 100644
--- a/Lib/subprocess.py
+++ b/Lib/subprocess.py
@@ -993,7 +993,7 @@ class Popen(object):
             elif sig == signal.CTRL_BREAK_EVENT:
                 os.kill(self.pid, signal.CTRL_BREAK_EVENT)
             else:
-                raise ValueError("Only SIGTERM is supported on Windows")
+                raise ValueError("Unsupported signal")
 
         def terminate(self):
             """Terminates the process