diff --git a/xCAT-server/share/xcat/netboot/rh/dracut_033/xcat-prepivot.sh b/xCAT-server/share/xcat/netboot/rh/dracut_033/xcat-prepivot.sh
index 56401e96d..6df3011e6 100755
--- a/xCAT-server/share/xcat/netboot/rh/dracut_033/xcat-prepivot.sh
+++ b/xCAT-server/share/xcat/netboot/rh/dracut_033/xcat-prepivot.sh
@@ -66,7 +66,7 @@ if [ ! -z $SNAPSHOTSERVER ]; then
             /bin/sh
             exit
         fi
-        RS= $(( $RANDOM % 20 ))
+        RS=$(( $RANDOM % 20 ))
         echo "Trying again in $RS seconds..."
         sleep $RS
     done
@@ -83,7 +83,7 @@ if [ ! -z $SNAPSHOTSERVER ]; then
             /bin/sh
             exit
         fi
-        RS= $(( $RANDOM % 20 ))
+        RS=$(( $RANDOM % 20 ))
         echo "Trying again in $RS seconds..."
         sleep $RS
     done
@@ -98,7 +98,7 @@ if [ ! -z $SNAPSHOTSERVER ]; then
             /bin/sh
             exit
         fi
-        RS= $(( $RANDOM % 20 ))
+        RS=$(( $RANDOM % 20 ))
         echo "Trying again in $RS seconds..."
         sleep $RS
     done
diff --git a/xCAT-server/share/xcat/netboot/rh/dracut_033/xcatroot b/xCAT-server/share/xcat/netboot/rh/dracut_033/xcatroot
index c4d6c17dd..94e1f026e 100755
--- a/xCAT-server/share/xcat/netboot/rh/dracut_033/xcatroot
+++ b/xCAT-server/share/xcat/netboot/rh/dracut_033/xcatroot
@@ -212,7 +212,7 @@ elif [ -r /rootimg-statelite.gz ]; then
             /bin/sh
             exit
         fi
-        RS= $(( $RANDOM % 20 ))
+        RS=$(( $RANDOM % 20 ))
         echo "Trying again in $RS seconds..."
         sleep $RS
     done
@@ -227,7 +227,7 @@ elif [ -r /rootimg-statelite.gz ]; then
             /bin/sh
             exit
         fi
-        RS= $(( $RANDOM % 20 ))
+        RS=$(( $RANDOM % 20 ))
         echo "Trying again in $RS seconds..."
         sleep $RS
     done