diff --git a/bbb-install.sh b/bbb-install.sh
index fa3fc87..2a6a597 100755
--- a/bbb-install.sh
+++ b/bbb-install.sh
@@ -901,7 +901,7 @@ install_greenlight_v3(){
 
   local PGDBNAME=greenlight-v3-production
   local SECRET_KEY_BASE
-  SECRET_KEY_BASE=$(docker run --rm --entrypoint bundle $GL_IMG_REPO exec rake secret)
+  SECRET_KEY_BASE=$(docker run --rm --entrypoint /bin/sh $GL_IMG_REPO -c "bundle exec rails secret")
 
   if [ -z "$SECRET_KEY_BASE" ]; then
     err "failed to generate greenlight-v3 secret key base - is docker running?"