diff --git a/packages/artifact_proxy/tool/generate_manifest.sh b/packages/artifact_proxy/tool/generate_manifest.sh
index b2122d41..3865521a 100755
--- a/packages/artifact_proxy/tool/generate_manifest.sh
+++ b/packages/artifact_proxy/tool/generate_manifest.sh
@@ -68,7 +68,7 @@ artifact_overrides:
   - download.flutter.io/io/flutter/x86_64_release/1.0.0-\$engine/x86_64_release-1.0.0-\$engine.jar
 
   # Common release artifacts
-  - flutter_infra_release/flutter/\$engine/flutter_patched_sdk_product.zip',
+  - flutter_infra_release/flutter/\$engine/flutter_patched_sdk_product.zip
 
   # iOS release artifacts
   # Includes unified Flutter.framework for device and simulator (debug)