diff --git a/src/main.ts b/src/main.ts
index e716dd6..2f534c8 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -82,6 +82,6 @@ import * as process from 'process';
     core.debug(`Done`);
     core.setOutput('version', version);
   } catch (error) {
-    core.setFailed(error.message);
+    core.setFailed((error as Error).message);
   }
 })();