diff --git a/symfony/mercure-bundle/0.3/config/packages/mercure.yaml b/symfony/mercure-bundle/0.3/config/packages/mercure.yaml
index f2a73954..c1a88988 100644
--- a/symfony/mercure-bundle/0.3/config/packages/mercure.yaml
+++ b/symfony/mercure-bundle/0.3/config/packages/mercure.yaml
@@ -2,7 +2,7 @@ mercure:
     hubs:
         default:
             url: '%env(MERCURE_URL)%'
-            public_url: '%env(MERCURE_PUBLIC_URL)%'
+            public_url: '%env(default::MERCURE_PUBLIC_URL)%'
             jwt:
                 secret: '%env(MERCURE_JWT_SECRET)%'
                 publish: '*'
diff --git a/symfony/mercure-bundle/0.4/config/packages/mercure.yaml b/symfony/mercure-bundle/0.4/config/packages/mercure.yaml
index 0f7173a3..970ea9ce 100644
--- a/symfony/mercure-bundle/0.4/config/packages/mercure.yaml
+++ b/symfony/mercure-bundle/0.4/config/packages/mercure.yaml
@@ -2,7 +2,7 @@ mercure:
     hubs:
         default:
             url: '%env(default::MERCURE_URL)%'
-            public_url: '%env(MERCURE_PUBLIC_URL)%'
+            public_url: '%env(default::MERCURE_PUBLIC_URL)%'
             jwt:
                 secret: '%env(MERCURE_JWT_SECRET)%'
                 publish: '*'