diff --git a/stack-rexray.yml b/stack-rexray.yml
index ce128d6..9d3a531 100644
--- a/stack-rexray.yml
+++ b/stack-rexray.yml
@@ -26,7 +26,7 @@ services:
       - rexray_do_token
     environment:
       - REXRAY_DO_TOKEN_FILE=/run/secrets/rexray_do_token
-    command: sh -c "docker plugin install --grant-all-permissions rexray/dobs DOBS_REGION=nyc3 DOBS_TOKEN=`cat $${REXRAY_DO_TOKEN_FILE}` DOBS_CONVERTUNDERSCORES=true"
+    command: sh -c "docker plugin install --grant-all-permissions rexray/dobs DOBS_REGION=nyc3 DOBS_TOKEN=$$(cat $$REXRAY_DO_TOKEN_FILE) DOBS_CONVERTUNDERSCORES=true"
     deploy:
       mode: global
       restart_policy: