diff --git a/mininet/cli.py b/mininet/cli.py
index b2398d2..b432f7c 100644
--- a/mininet/cli.py
+++ b/mininet/cli.py
@@ -165,9 +165,9 @@ class CLI( Cmd ):
 
     # pylint: enable-msg=W0703,W0122
 
-    def do_pingall( self, _line ):
+    def do_pingall( self, line ):
         "Ping between all hosts."
-        self.mn.pingAll()
+        self.mn.pingAll( line )
 
     def do_pingpair( self, _line ):
         "Ping between first two hosts, useful for testing."
diff --git a/mininet/net.py b/mininet/net.py
index 774545c..e7003c3 100755
--- a/mininet/net.py
+++ b/mininet/net.py
@@ -578,10 +578,10 @@ class Mininet( object ):
                     (rttmin, rttavg, rttmax, rttdev) )
         return all_outputs
 
-    def pingAll( self ):
+    def pingAll( self, timeout=None ):
         """Ping between all hosts.
            returns: ploss packet loss percentage"""
-        return self.ping()
+        return self.ping( timeout=timeout )
 
     def pingPair( self ):
         """Ping between first two hosts, useful for testing.