diff --git a/README.md b/README.md
index bc9ce61..9fdfbd8 100644
--- a/README.md
+++ b/README.md
@@ -56,7 +56,7 @@ This image respects the following custom environment variables to be passed duri
 
 - `tile_urls`: Add as many (space-separated) URLs as you like, e.g. https://download.geofabrik.de/europe/andorra-latest.osm.pbf
 - `use_tiles_ignore_pbf`: `True` uses a local tile.tar file and skips building. Default `True`.
-- `force_rebuild`: `True` forces a rebuild of the routing tiles. Default `False`.
+- `force_rebuild`: `True` forces a rebuild of the routing tiles and sets `build_tar` to `Force`. Default `False`.
 - `build_elevation`: `True` downloads elevation tiles which are covering the routing graph. `Force` will do the same, but first delete any existing elevation tiles. Default `False`.
 - `build_admins`: `True` builds the admin db needed for things like border-crossing penalties and detailed routing responses. `Force` will do the same, but first delete the existing db. Default `False`.
 - `build_time_zones`: `True` builds the timezone db which is needed for time-dependent routing. `Force` will do the same, but first delete the existing db. Default `False`.
diff --git a/scripts/run.sh b/scripts/run.sh
index 2b4545a..5463004 100755
--- a/scripts/run.sh
+++ b/scripts/run.sh
@@ -17,11 +17,15 @@ run_cmd() {
 }
 
 do_build_tar() {
-  if ([[ ${build_tar} == "True" && ! -f $TILE_TAR ]]) || [[ ${build_tar} == "Force" ]]; then
+  local build_tar_local=$1
+  if ([[ ${build_tar_local} == "True" && ! -f $TILE_TAR ]]) || [[ ${build_tar_local} == "Force" ]]; then
     options="-c ${CONFIG_FILE} -v"
     if ! [[ -z ${traffic_name} ]]; then
       options="${options} -t"
     fi
+    if [[${build_tar_local} == "Force" ]]; then 
+      options="${options} --overwrite"
+    fi 
     run_cmd "valhalla_build_extract ${options}"
   fi
 }
@@ -49,14 +53,17 @@ fi
 if [[ -z $serve_tiles ]]; then
   serve_tiles="True"
 fi
+if [[ "$force_rebuild" == "True" ]]; then
+  build_tar="Force"
+fi
 
 # evaluate CMD
 if [[ $1 == "build_tiles" ]]; then
 
   run_cmd "/valhalla/scripts/configure_valhalla.sh ${CONFIG_FILE} ${CUSTOM_FILES} ${TILE_DIR} ${TILE_TAR}"
   # tar tiles unless not wanted
-  if [[ "$build_tar" == "True" ]] || [[ ${build_tar} == "Force" ]]; then
-    do_build_tar
+  if [[ "$build_tar" == "True" ]] || [[ "$build_tar" == "Force" ]]; then
+    do_build_tar "$build_tar"
   else
     echo "WARNING: Skipping tar building. Expect degraded performance while using Valhalla."
   fi
@@ -86,7 +93,7 @@ if [[ $1 == "build_tiles" ]]; then
     echo "INFO: Not serving tiles. Exiting."
   fi
 elif [[ $1 == "tar_tiles" ]]; then
-  do_build_tar
+  do_build_tar "$build_tar"
 else
   echo "ERROR: Unrecognized CMD: '$1'"
   exit 1