diff --git a/util-iso.sh b/util-iso.sh
index b9096f5..e6e67b0 100755
--- a/util-iso.sh
+++ b/util-iso.sh
@@ -160,6 +160,14 @@ run_build() {
         else
             info "checksums for [$f] already created"
         fi
+        if [[ ! -e $f.sig ]]; then
+            sign_with_key $f
+        elif [[ $f -nt $f.sig ]]; then
+            rm $f.sig
+            sign_with_key $f
+        else
+            info "signature file for [$f] already created"
+        fi
     done
     show_elapsed_time "${FUNCNAME}" "${timer_start}"
 }
diff --git a/util.sh b/util.sh
index a529619..046ff81 100755
--- a/util.sh
+++ b/util.sh
@@ -8,8 +8,6 @@
 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 # GNU General Public License for more details.
 
-[[ -r ${src_dir}/util-msg.sh ]] && source ${src_dir}/util-msg.sh
-
 get_timer(){
     echo $(date +%s)
 }