diff --git a/cli/tools/vendor/build.rs b/cli/tools/vendor/build.rs
index 341ef86841..f56204c772 100644
--- a/cli/tools/vendor/build.rs
+++ b/cli/tools/vendor/build.rs
@@ -68,6 +68,14 @@ pub fn build(
   graph.lock()?;
   graph.valid()?;
 
+  let graph_errors = graph.errors();
+  if !graph_errors.is_empty() {
+    for err in &graph_errors {
+      log::error!("{}", err);
+    }
+    bail!("failed vendoring");
+  }
+
   // figure out how to map remote modules to local
   let all_modules = graph.modules();
   let remote_modules = all_modules
@@ -1003,6 +1011,26 @@ mod test {
     );
   }
 
+  #[tokio::test]
+  async fn vendor_file_fails_loading_dynamic_import() {
+    let mut builder = VendorTestBuilder::with_default_setup();
+    let err = builder
+      .with_loader(|loader| {
+        loader.add("/mod.ts", "import 'https://localhost/mod.ts';");
+        loader.add("https://localhost/mod.ts", "await import('./test.ts');");
+        loader.add_failure(
+          "https://localhost/test.ts",
+          "500 Internal Server Error",
+        );
+      })
+      .build()
+      .await
+      .err()
+      .unwrap();
+
+    assert_eq!(err.to_string(), "failed vendoring");
+  }
+
   fn to_file_vec(items: &[(&str, &str)]) -> Vec<(String, String)> {
     items
       .iter()
diff --git a/cli/tools/vendor/test.rs b/cli/tools/vendor/test.rs
index 7a8feb94bb..836fb579bd 100644
--- a/cli/tools/vendor/test.rs
+++ b/cli/tools/vendor/test.rs
@@ -41,6 +41,22 @@ impl TestLoader {
     &mut self,
     path_or_specifier: impl AsRef<str>,
     text: impl AsRef<str>,
+  ) -> &mut Self {
+    self.add_result(path_or_specifier, Ok((text.as_ref().to_string(), None)))
+  }
+
+  pub fn add_failure(
+    &mut self,
+    path_or_specifier: impl AsRef<str>,
+    message: impl AsRef<str>,
+  ) -> &mut Self {
+    self.add_result(path_or_specifier, Err(message.as_ref().to_string()))
+  }
+
+  fn add_result(
+    &mut self,
+    path_or_specifier: impl AsRef<str>,
+    result: RemoteFileResult,
   ) -> &mut Self {
     if path_or_specifier
       .as_ref()
@@ -49,14 +65,12 @@ impl TestLoader {
     {
       self.files.insert(
         ModuleSpecifier::parse(path_or_specifier.as_ref()).unwrap(),
-        Ok((text.as_ref().to_string(), None)),
+        result,
       );
     } else {
       let path = make_path(path_or_specifier.as_ref());
       let specifier = ModuleSpecifier::from_file_path(path).unwrap();
-      self
-        .files
-        .insert(specifier, Ok((text.as_ref().to_string(), None)));
+      self.files.insert(specifier, result);
     }
     self
   }