diff --git a/symfony/panther/1.0/manifest.json b/symfony/panther/1.0/manifest.json
index ee0eb1e37..e9710ea15 100644
--- a/symfony/panther/1.0/manifest.json
+++ b/symfony/panther/1.0/manifest.json
@@ -1,7 +1,7 @@
 {
     "dockerfile": [
         "# Chromium and ChromeDriver",
-        "ENV PANTHER_NO_SANDBOX 1",
+        "ENV PANTHER_NO_SANDBOX=1",
         "# Not mandatory, but recommended",
         "ENV PANTHER_CHROME_ARGUMENTS='--disable-dev-shm-usage'",
         "# hadolint ignore=DL3008",