diff --git a/frontend/src/components/workspace/artifacts/artifact-file-detail.tsx b/frontend/src/components/workspace/artifacts/artifact-file-detail.tsx
index 3c207add..d67c0fed 100644
--- a/frontend/src/components/workspace/artifacts/artifact-file-detail.tsx
+++ b/frontend/src/components/workspace/artifacts/artifact-file-detail.tsx
@@ -1276,7 +1276,7 @@ function ArtifactOfficePreview({
               type="button"
               className={cn(
                 "rounded px-4 py-3 text-xs whitespace-nowrap",
-                activeSheet === sheetName
+                activeSheet === sheetNames[0]
                   ? "bg-[#1500331a] text-[#000000]"
                   : "text-muted-foreground hover:text-foreground",
               )}