diff --git a/Doc/library/signal.rst b/Doc/library/signal.rst
index 54cce53..94f305c 100644
--- a/Doc/library/signal.rst
+++ b/Doc/library/signal.rst
@@ -144,7 +144,7 @@
 
    def handler(signum, frame):
        print 'Signal handler called with signal', signum
-       raise IOError, "Couldn't open device!"
+       raise IOError("Couldn't open device!")
 
    # Set the signal handler and a 5-second alarm
    signal.signal(signal.SIGALRM, handler)