diff --git a/packages/grafana-toolkit/src/cli/tasks/plugin.build.ts b/packages/grafana-toolkit/src/cli/tasks/plugin.build.ts
index 348dd2ea679..12cdccc7f14 100644
--- a/packages/grafana-toolkit/src/cli/tasks/plugin.build.ts
+++ b/packages/grafana-toolkit/src/cli/tasks/plugin.build.ts
@@ -149,7 +149,9 @@ export const lintPlugin = useSpinner<Fixable>('Linting', async ({ fix }) => {
 
   if (lintResults.length > 0) {
     console.log('\n');
-    const failures: RuleFailure[] = lintResults.flat();
+    const failures = lintResults.reduce<RuleFailure[]>((failures, result) => {
+      return [...failures, ...result.failures];
+    }, []);
     failures.forEach(f => {
       // tslint:disable-next-line
       console.log(