diff --git a/packages/build/src/run-draft.ts b/packages/build/src/run-draft.ts
index 4f56076db8..311684aa21 100644
--- a/packages/build/src/run-draft.ts
+++ b/packages/build/src/run-draft.ts
@@ -52,7 +52,7 @@ export async function runDraft(
         signingComment: 'Evergreen Automatic Signing (mongosh)'
       }
     );
-    const signatureFile = tarballFile.path + '.sig';
+    const signatureFile = downloadedArtifact + '.sig';
 
     await Promise.all([
       [ downloadedArtifact, tarballFile.contentType ],