diff --git a/completions/su b/completions/su
index 2c6254d3..87a27b98 100644
--- a/completions/su
+++ b/completions/su
@@ -15,7 +15,7 @@ _su() # linux-specific completion
             _filedir
             return
             ;;
-        -c|--command)
+        -c|--command|--session-command)
             local IFS=$'\n'
             compopt -o filenames
             COMPREPLY=( $( compgen -d -c -- "$cur" ) )