diff --git a/sky/tools/skyanalyzer b/sky/tools/skyanalyzer
index 122f66628e675..08825deb4e704 100755
--- a/sky/tools/skyanalyzer
+++ b/sky/tools/skyanalyzer
@@ -57,7 +57,8 @@ def main():
     try:
       subprocess.check_output([
           DARTANALYZER, "--package-warnings", args.app_path,
-          "--package-root", os.path.join(WORKBENCH, "packages")
+          "--package-root", os.path.join(WORKBENCH, "packages"),
+          "--fatal-warnings"
       ], stderr=subprocess.STDOUT, cwd=WORKBENCH)
     except subprocess.CalledProcessError as e:
       errors = [l for l in e.output.split('\n')