diff --git a/openproject/Dockerfile b/openproject/Dockerfile
index 268fbcb65..96b8097c3 100644
--- a/openproject/Dockerfile
+++ b/openproject/Dockerfile
@@ -39,7 +39,7 @@ USER root
 
 RUN sed -i "s|/bin/bash|/bin/bashio|g" /app/docker/prod/entrypoint.sh && \
     sed -i "1a /./ha_entrypoint.sh" /app/docker/prod/entrypoint.sh && \
-    sed -i '2a\for variable in OPENPROJECT_SECRET_KEY_BASE OPENPROJECT_HOST__NAME OPENPROJECT_HTTPS OPENPROJECT_DEFAULT__LANGUAGE; do if bashio::config.has_value $variable; then export $variable="$(bashio::config $variable)"; fi; done' /app/docker/prod/entrypoint.sh
+    sed -i "2a\for variable in OPENPROJECT_SECRET_KEY_BASE OPENPROJECT_HOST__NAME OPENPROJECT_HTTPS OPENPROJECT_DEFAULT__LANGUAGE; do if bashio::config.has_value \$variable; then export \$variable=\"\$(bashio::config $variable)\"; fi; done" /app/docker/prod/entrypoint.sh
 
 ##################
 # 3 Install apps #