diff --git a/examples/docker-compose-generic-pack.yml b/examples/docker-compose-generic-pack.yml
index 314a80833c5..dfb2d1522e7 100644
--- a/examples/docker-compose-generic-pack.yml
+++ b/examples/docker-compose-generic-pack.yml
@@ -13,6 +13,7 @@ services:
       VERSION: ${VERSION:-1.17.1}
       FORGEVERSION: ${FORGEVERSION:-37.0.90}
       GENERIC_PACK: /modpacks/${MODPACK:-Server-Files-0.0.21.zip}
+      REMOVE_OLD_MODS: "${REMOVE_OLD_MODS:-false}"
     ports:
       - "25565:25565"
 
diff --git a/scripts/start-setupModpack b/scripts/start-setupModpack
index 02036b46aa9..37bbaf784d6 100755
--- a/scripts/start-setupModpack
+++ b/scripts/start-setupModpack
@@ -6,6 +6,7 @@ set -e -o pipefail
 : "${MODS_FILE:=}"
 : "${REMOVE_OLD_MODS_DEPTH:=1} "
 : "${REMOVE_OLD_MODS_INCLUDE:=*.jar}"
+sum_file=/data/.generic_pack.sum
 
 # shellcheck source=start-utils
 . "${SCRIPTS:-/}start-utils"
@@ -18,6 +19,7 @@ CURSE_URL_BASE=${CURSE_URL_BASE:-https://minecraft.curseforge.com/projects}
 if isTrue "${REMOVE_OLD_MODS}" && [ -z "${MODS_FILE}" ]; then
   removeOldMods /data/mods
   removeOldMods /data/plugins
+  rm -f "$sum_file"
 fi
 
 # If packwiz url passed, bootstrap packwiz and update mods before other modpack processing
@@ -204,7 +206,6 @@ if [[ "${GENERIC_PACKS}" ]]; then
     fi
   done
 
-  sum_file=/data/.generic_pack.sum
   isDebugging && [ -f "$sum_file}" ] && cat "$sum_file"
   if ! sha256sum -c "${sum_file}" --status 2> /dev/null; then
     base_dir=/tmp/generic_pack_base