diff --git a/src/stack-cli.ts b/src/stack-cli.ts
index f53e649..57041db 100644
--- a/src/stack-cli.ts
+++ b/src/stack-cli.ts
@@ -49,7 +49,10 @@ export class StackCLI {
   }
 
   async installed(): Promise<boolean> {
-    const ec = await exec.exec("which", ["stack"]);
+    const ec = await exec.exec("which", ["stack"], {
+      silent: true,
+      ignoreReturnCode: true,
+    });
     return ec == 0;
   }