diff --git a/packages/lib/factorio/patch.js b/packages/lib/factorio/patch.js
index f96e931a..7f92232f 100644
--- a/packages/lib/factorio/patch.js
+++ b/packages/lib/factorio/patch.js
@@ -8,6 +8,7 @@ const path = require("path");
 const semver = require("semver");
 
 const libHash = require("../hash");
+const { findRoot } = require("../zip_ops");
 
 
 const knownScenarios = {
@@ -21,42 +22,6 @@ const knownScenarios = {
 	},
 };
 
-/**
- * Returns the root folder in the zip file
- *
- * Returns the name of the folder that all files in the zip file is
- * contained in.  Throws an error if there are multiple such folders.
- *
- * @param {JSZip} zip - Zip to search through.
- * @returns {string} name of the root folder.
- * @memberof module:lib/factorio
- * @private
- * @inner
- */
-function findRoot(zip) {
-	let root = null;
-	zip.forEach((relativePath, file) => {
-		let index = relativePath.indexOf("/");
-		if (index === -1) {
-			throw new Error(`Zip contains file '${relativePath}' in root dir`);
-		}
-
-		let pathRoot = relativePath.slice(0, index);
-		if (root === null) {
-			root = pathRoot;
-		} else if (root !== pathRoot) {
-			throw new Error("Zip contains multiple root folders");
-		}
-	});
-
-	if (root === null) {
-		throw new Error("Empty zip file");
-	}
-
-	return root;
-}
-
-
 /**
  * Generates control.lua code for loading the Clusterio modules
  *
@@ -295,7 +260,6 @@ module.exports = {
 	patch,
 
 	// For testing only
-	_findRoot: findRoot,
 	_generateLoader: generateLoader,
 	_reorderDependencies: reorderDependencies,
 };
diff --git a/packages/lib/index.js b/packages/lib/index.js
index 0c89ef93..37777950 100644
--- a/packages/lib/index.js
+++ b/packages/lib/index.js
@@ -18,6 +18,7 @@ const libPrometheus = require("./prometheus");
 const libSchema = require("./schema");
 const libSharedCommands = require("./shared_commands");
 const libUsers = require("./users");
+const libZipOps = require("./zip_ops");
 
 const ExponentialBackoff = require("./ExponentialBackoff");
 const RateLimiter = require("./RateLimiter");
@@ -43,6 +44,7 @@ module.exports = {
 	libSchema,
 	libSharedCommands,
 	libUsers,
+	libZipOps,
 
 	ExponentialBackoff,
 	RateLimiter,
diff --git a/packages/lib/zip_ops.js b/packages/lib/zip_ops.js
new file mode 100644
index 00000000..f05c09b5
--- /dev/null
+++ b/packages/lib/zip_ops.js
@@ -0,0 +1,40 @@
+"use strict";
+
+/**
+ * Returns the root folder in the zip file
+ *
+ * Returns the name of the folder that all files in the zip file is
+ * contained in.  Throws an error if there are multiple such folders.
+ *
+ * @param {JSZip} zip - Zip to search through.
+ * @returns {string} name of the root folder.
+ * @memberof module:lib/factorio
+ * @private
+ * @inner
+ */
+function findRoot(zip) {
+	let root = null;
+	zip.forEach((relativePath, file) => {
+		let index = relativePath.indexOf("/");
+		if (index === -1) {
+			throw new Error(`Zip contains file '${relativePath}' in root dir`);
+		}
+
+		let pathRoot = relativePath.slice(0, index);
+		if (root === null) {
+			root = pathRoot;
+		} else if (root !== pathRoot) {
+			throw new Error("Zip contains multiple root folders");
+		}
+	});
+
+	if (root === null) {
+		throw new Error("Empty zip file");
+	}
+
+	return root;
+}
+
+module.exports = {
+	findRoot,
+};
diff --git a/test/lib/factorio/patch.js b/test/lib/factorio/patch.js
index 00850590..e301d583 100644
--- a/test/lib/factorio/patch.js
+++ b/test/lib/factorio/patch.js
@@ -8,47 +8,6 @@ const libFactorio = require("@clusterio/lib/factorio");
 
 
 describe("lib/factorio", function() {
-	describe("findRoot()", function() {
-		it("should find the root of a zip", function() {
-			let zip = new JSZip();
-			zip.file("root/foo.txt", "");
-			zip.file("root/bar.txt", "");
-
-			assert.equal(libFactorio._findRoot(zip), "root");
-		});
-
-		it("should throw if files are at the root of the zip", function() {
-			let zip = new JSZip();
-			zip.file("root/foo.txt", "");
-			zip.file("bar.txt", "");
-
-			assert.throws(
-				() => libFactorio._findRoot(zip),
-				new Error("Zip contains file 'bar.txt' in root dir")
-			);
-		});
-
-		it("should throw if there are multiple root dirs", function() {
-			let zip = new JSZip();
-			zip.file("root-1/foo.txt", "");
-			zip.file("root-2/bar.txt", "");
-
-			assert.throws(
-				() => libFactorio._findRoot(zip),
-				new Error("Zip contains multiple root folders")
-			);
-		});
-
-		it("should throw if given an empty zip file", function() {
-			let zip = new JSZip();
-
-			assert.throws(
-				() => libFactorio._findRoot(zip),
-				new Error("Empty zip file")
-			);
-		});
-	});
-
 	describe("generateLoader()", function() {
 		let reference = [
 			"-- Auto generated scenario module loader created by Clusterio",
diff --git a/test/lib/zip_ops.js b/test/lib/zip_ops.js
new file mode 100644
index 00000000..622c65ae
--- /dev/null
+++ b/test/lib/zip_ops.js
@@ -0,0 +1,49 @@
+"use strict";
+const assert = require("assert").strict;
+const JSZip = require("jszip");
+
+const { findRoot } = require("@clusterio/lib/zip_ops");
+
+
+describe("lib/factorio", function() {
+	describe("findRoot()", function() {
+		it("should find the root of a zip", function() {
+			let zip = new JSZip();
+			zip.file("root/foo.txt", "");
+			zip.file("root/bar.txt", "");
+
+			assert.equal(findRoot(zip), "root");
+		});
+
+		it("should throw if files are at the root of the zip", function() {
+			let zip = new JSZip();
+			zip.file("root/foo.txt", "");
+			zip.file("bar.txt", "");
+
+			assert.throws(
+				() => findRoot(zip),
+				new Error("Zip contains file 'bar.txt' in root dir")
+			);
+		});
+
+		it("should throw if there are multiple root dirs", function() {
+			let zip = new JSZip();
+			zip.file("root-1/foo.txt", "");
+			zip.file("root-2/bar.txt", "");
+
+			assert.throws(
+				() => findRoot(zip),
+				new Error("Zip contains multiple root folders")
+			);
+		});
+
+		it("should throw if given an empty zip file", function() {
+			let zip = new JSZip();
+
+			assert.throws(
+				() => findRoot(zip),
+				new Error("Empty zip file")
+			);
+		});
+	});
+});