diff --git a/fail2ban/client/csocket.py b/fail2ban/client/csocket.py
index 86d84a4d..761a17ff 100644
--- a/fail2ban/client/csocket.py
+++ b/fail2ban/client/csocket.py
@@ -64,6 +64,6 @@ class CSocket:
 		while msg.rfind(CSocket.END_STRING) == -1:
 			chunk = sock.recv(6)
 			if chunk == '':
-				raise RuntimeError, "socket connection broken"
+				raise RuntimeError("socket connection broken")
 			msg = msg + chunk
 		return loads(msg)