diff --git a/src/webpack.config.js b/src/webpack.config.js
index c08f42f7..1b208675 100644
--- a/src/webpack.config.js
+++ b/src/webpack.config.js
@@ -53,7 +53,9 @@ const ENABLE_CACHING = isLocal ? config.options.caching : false;
 // Handle the "all" option in externals
 // And add the forceExclude packages to it because they shouldn't be Webpacked
 const computedExternals = (
-  externals === "all" ? [nodeExternals()] : externals
+  externals === "all"
+    ? [nodeExternals({ additionalModuleDirs: [path.resolve(process.cwd(), "../../node_modules")] })]
+    : externals
 ).concat(forceExclude);
 
 const extensions = [
diff --git a/tests/externals-all/externals-all.test.js b/tests/externals-all/externals-all.test.js
index 9d9c2d54..d1129e1e 100644
--- a/tests/externals-all/externals-all.test.js
+++ b/tests/externals-all/externals-all.test.js
@@ -16,5 +16,5 @@ test("externals all option", async () => {
   /*
     Ensure that array-first is packaged as a part of the "all" externals option
   */
-  expect(result).toMatch(/Packing external modules: array-first@\^[\d\\.]+/);
+  expect(result).toMatch(/Packing external modules: source-map-support, array-first@\^[\d\\.]+/);
 });