diff --git a/util/versioncheck.py b/util/versioncheck.py
index cdf6c2218edaa802f429a4ac31ed5e9a424f6621..7180f4935f56a5f622990839e1b44e30e6cc47a5 100755
--- a/util/versioncheck.py
+++ b/util/versioncheck.py
@@ -8,7 +8,7 @@
 version = version.strip()
 
 # Find all Mininet path references
-lines = co( "grep -or 'Mininet \w\.\w\.\w[\w\+]*' *", shell=True )
+lines = co( "grep -or 'Mininet \w\+\.\w\+\.\w\+[+]*' *", shell=True )
 
 error = False