diff --git a/extensions/armbian-config.sh b/extensions/armbian-config.sh
index 51639b6ca481..dc850c52fb62 100644
--- a/extensions/armbian-config.sh
+++ b/extensions/armbian-config.sh
@@ -8,7 +8,7 @@ function custom_apt_repo__add_armbian-github-repo() {
 	URIs: https://github.armbian.com/configng
 	Suites: stable
 	Components: main
-	Signed-By: "${APT_SIGNING_KEY_FILE}"
+	Signed-By: ${APT_SIGNING_KEY_FILE}
 	EOF
 }