diff --git a/ghost/minifier/lib/Minifier.js b/ghost/minifier/lib/Minifier.js
index 18cf5891a83..59168e29b15 100644
--- a/ghost/minifier/lib/Minifier.js
+++ b/ghost/minifier/lib/Minifier.js
@@ -4,6 +4,7 @@ const tpl = require('@tryghost/tpl');
 const glob = require('tiny-glob');
 const path = require('path');
 const fs = require('fs').promises;
+const isWin = process.platform === 'win32';
 
 const messages = {
     badDestination: {
@@ -69,7 +70,11 @@ class Minifier {
     }
 
     async getMatchingFiles(src) {
-        return await glob(this.getFullSrc(src));
+        let fullSrc = this.getFullSrc(src);
+        if (isWin) { 
+            fullSrc = fullSrc.replace(/\\/g,'/');
+        }
+        return await glob(fullSrc);
     }
 
     async readFiles(files) {
diff --git a/ghost/minifier/test/minifier.test.js b/ghost/minifier/test/minifier.test.js
index f79896d8b4e..a084c11c714 100644
--- a/ghost/minifier/test/minifier.test.js
+++ b/ghost/minifier/test/minifier.test.js
@@ -28,31 +28,31 @@ describe('Minifier', function () {
             let result = await minifier.getMatchingFiles('css/*.css');
 
             result.should.be.an.Array().with.lengthOf(3);
-            result[0].should.eql('test/fixtures/basic-cards/css/bookmark.css');
-            result[1].should.eql('test/fixtures/basic-cards/css/empty.css');
-            result[2].should.eql('test/fixtures/basic-cards/css/gallery.css');
+            result[0].should.eql(path.join('test','fixtures','basic-cards','css','bookmark.css'));
+            result[1].should.eql(path.join('test','fixtures','basic-cards','css','empty.css'));
+            result[2].should.eql(path.join('test','fixtures','basic-cards','css','gallery.css'));
         });
 
         it('match glob range e.g. css/bookmark.css and css/empty.css (css/@(bookmark|empty).css)', async function () {
             let result = await minifier.getMatchingFiles('css/@(bookmark|empty).css');
             
             result.should.be.an.Array().with.lengthOf(2);
-            result[0].should.eql('test/fixtures/basic-cards/css/bookmark.css');
-            result[1].should.eql('test/fixtures/basic-cards/css/empty.css');
+            result[0].should.eql(path.join('test','fixtures','basic-cards','css','bookmark.css'));
+            result[1].should.eql(path.join('test','fixtures','basic-cards','css','empty.css'));
         });
 
         it('reverse match glob e.g. css/!(bookmark).css', async function () {
             let result = await minifier.getMatchingFiles('css/!(bookmark).css');
 
             result.should.be.an.Array().with.lengthOf(2);
-            result[0].should.eql('test/fixtures/basic-cards/css/empty.css');
-            result[1].should.eql('test/fixtures/basic-cards/css/gallery.css');
+            result[0].should.eql(path.join('test','fixtures','basic-cards','css','empty.css'));
+            result[1].should.eql(path.join('test','fixtures','basic-cards','css','gallery.css'));
         });
         it('reverse match glob e.g. css/!(bookmark|gallery).css', async function () {
             let result = await minifier.getMatchingFiles('css/!(bookmark|gallery).css');
 
             result.should.be.an.Array().with.lengthOf(1);
-            result[0].should.eql('test/fixtures/basic-cards/css/empty.css');
+            result[0].should.eql(path.join('test','fixtures','basic-cards','css','empty.css'));
         });
     });