diff --git a/entrypoint.sh b/entrypoint.sh
index 6e18e07..f8a7c42 100755
--- a/entrypoint.sh
+++ b/entrypoint.sh
@@ -6,7 +6,7 @@ set -e
 [ -z "${SIGNAL_CLI_CONFIG_DIR}" ] && echo "SIGNAL_CLI_CONFIG_DIR environmental variable needs to be set! Aborting!" && exit 1;
 
 usermod -u ${SIGNAL_CLI_UID} signal-api
-groupmod -g ${SIGNAL_CLI_GID} signal-api
+groupmod -o -g ${SIGNAL_CLI_GID} signal-api
 
 # Fix permissions to ensure backward compatibility
 chown ${SIGNAL_CLI_UID}:${SIGNAL_CLI_GID} -R ${SIGNAL_CLI_CONFIG_DIR}