diff --git a/sdn-install b/sdn-install
index 0e28390..788c8bf 100755
--- a/sdn-install
+++ b/sdn-install
@@ -125,7 +125,7 @@ done
 
 # Figure out the shell to integrate with
 login=$(basename "$SHELL")
-actual=$(ps -p $$ -o ppid= | xargs ps -o comm= -p)
+actual=$(ps -p $$ -o ppid= | xargs ps -o comm= -p | sed 's/^-//')
 if [ -z "$shell" ]
 then
   if [ "$login" != "$actual" ]