diff --git a/packages/plugin-legacy/src/index.ts b/packages/plugin-legacy/src/index.ts
index d356793b231c72..223659932f8404 100644
--- a/packages/plugin-legacy/src/index.ts
+++ b/packages/plugin-legacy/src/index.ts
@@ -270,6 +270,13 @@ function viteLegacyPlugin(options: Options = {}): Plugin[] {
           ),
         )
       }
+      if (config.isWorker) {
+        config.logger.warn(
+          colors.yellow(
+            `plugin-legacy should not be passed to 'worker.plugins'. Pass to 'plugins' instead. Note that generating legacy chunks for workers are not supported by plugin-legacy.`,
+          ),
+        )
+      }
     },
   }