diff --git a/heavy_script.sh b/heavy_script.sh
index 3daae58d..b148a01d 100644
--- a/heavy_script.sh
+++ b/heavy_script.sh
@@ -5,7 +5,7 @@
 
 
 
-ARGS="$@" ; echo "$ARGS" | sed -e 's/[:space:]\?\-\-self\-update[:space:]\?//'
+ARGS="$@" ; echo "$ARGS" | sed -e 's/[[:space:]]\?\-\-self\-update[[:space:]]\?//'
 SCRIPT=$(readlink -f "$0")
 SCRIPTPATH=$(dirname "$SCRIPT")
 SCRIPTNAME="$0"