diff --git a/frontend/next.config.mjs b/frontend/next.config.mjs
index fcb7365f1..528a6a3e3 100644
--- a/frontend/next.config.mjs
+++ b/frontend/next.config.mjs
@@ -15,7 +15,7 @@ const nextConfig = {
   },
 
   env: {
-    NEXT_PUBLIC_BUILD_TIME: Date.now(),
+    NEXT_PUBLIC_BUILD_TIME: `${Date.now()}`,
   },
 
   output: "export",