diff --git a/src/commands/build/wranglerjs/mod.rs b/src/commands/build/wranglerjs/mod.rs
index 402182c52..54b69ca7e 100644
--- a/src/commands/build/wranglerjs/mod.rs
+++ b/src/commands/build/wranglerjs/mod.rs
@@ -122,7 +122,9 @@ fn write_wranglerjs_output(
 ) -> Result<(), failure::Error> {
     if output.has_errors() {
         message::user_error(output.get_errors().as_str());
-        failure::bail!("Webpack returned an error");
+        failure::bail!(
+            "Webpack returned an error. Try re-running npm install, or yarn check --verify-tree."
+        );
     }
 
     bundle.write(output)?;