diff --git a/adm-zip.js b/adm-zip.js
index 33316f6..51e37d7 100644
--- a/adm-zip.js
+++ b/adm-zip.js
@@ -423,13 +423,14 @@ module.exports = function (/**String*/ input, /** object */ options) {
          * @param {number | object} attr - number as unix file permissions, object as filesystem Stats object
          */
         addFile: function (/**String*/ entryName, /**Buffer*/ content, /**String*/ comment, /**Number*/ attr) {
+            entryName = Utils.canonical(entryName);
             let entry = getEntry(entryName);
             const update = entry != null;
 
             // prepare new entry
             if (!update) {
                 entry = new ZipEntry();
-                entry.entryName = Utils.canonical(entryName);
+                entry.entryName = entryName;
             }
             entry.comment = comment || "";
 
diff --git a/test/large_directory_size/large_directory_size.test.js b/test/large_directory_size/large_directory_size.test.js
index 571659d..1d896e2 100644
--- a/test/large_directory_size/large_directory_size.test.js
+++ b/test/large_directory_size/large_directory_size.test.js
@@ -14,4 +14,3 @@ describe("read zip file header with invalid large number of entries", () => {
         }, new Error("Number of disk entries is too large"));
     });
 });
-
diff --git a/test/mocha.js b/test/mocha.js
index cbc481f..9b816b1 100644
--- a/test/mocha.js
+++ b/test/mocha.js
@@ -255,6 +255,26 @@ describe("adm-zip", () => {
         expect(zip2Entries).to.deep.equal(["c.txt", "b.txt", "a.txt"]);
     });
 
+    it("windows style path with backslash should be converted to slashes", () => {
+        const content = "test";
+        const comment = "comment";
+
+        // is sorting working - value "false"
+        const zip1 = new Zip({ noSort: true });
+        // next 3 lines are with identical names, so only one file is added
+        zip1.addFile("..\\..\\..\\windows\\system32\\drivers\\etc\\hosts.txt", content, comment);
+        zip1.addFile("aa\\bb\\..\\cc\\..\\..\\windows\\system32\\drivers\\admin\\..\\etc\\hosts.txt", content, comment);
+        zip1.addFile(".\\windows\\system32\\drivers\\etc\\hosts.txt", content, comment);
+        // 3 other file
+        zip1.addFile("system32\\drivers\\etc\\hosts.txt", content, comment);
+        zip1.addFile("drivers\\etc\\hosts.txt", content, comment);
+        zip1.addFile(".\\hosts.txt", content, comment);
+        zip1.toBuffer();
+
+        const zip1Entries = zip1.getEntries().map((e) => e.entryName);
+        expect(zip1Entries).to.deep.equal(["windows/system32/drivers/etc/hosts.txt", "system32/drivers/etc/hosts.txt", "drivers/etc/hosts.txt", "hosts.txt"]);
+    });
+
     /*
     it("repro: symlink", () => {
         const zip = new Zip("./test/assets/symlink.zip");