diff --git a/desk b/desk
index 5e5aea8..7b786f4 100755
--- a/desk
+++ b/desk
@@ -287,7 +287,7 @@ get_running_shell() {
     else
         # Strip leading dash for login shells.
         # If the parent process is a login shell, guess bash.
-        local CMDLINE_SHELL=$(ps -o args -p $PPID | tail -1 | sed -e 's/login/bash/' -e 's/^-//')
+        local CMDLINE_SHELL=$(ps -o comm= -p $PPID | tail -1 | sed -e 's/login/bash/' -e 's/^-//')
     fi
 
     if [ ! -z "$CMDLINE_SHELL" ]; then