diff --git a/runtime/js/99_main.js b/runtime/js/99_main.js
index e3b14fdafa8719..c874c5082dc69a 100644
--- a/runtime/js/99_main.js
+++ b/runtime/js/99_main.js
@@ -629,7 +629,7 @@ function bootstrapMainRuntime(runtimeOptions, warmup = false) {
         if (serve) {
           if (mode === executionModes.run) {
             // deno-lint-ignore no-console
-            console.error(
+            console.warn(
               `%cwarning: %cDetected %cexport default { fetch }%c, did you mean to run \"deno serve\"?`,
               "color: yellow;",
               "color: inherit;",