diff --git a/services/web/app/src/Features/Compile/CompileController.js b/services/web/app/src/Features/Compile/CompileController.js
index 8f2e289680..69ad20e398 100644
--- a/services/web/app/src/Features/Compile/CompileController.js
+++ b/services/web/app/src/Features/Compile/CompileController.js
@@ -347,6 +347,7 @@ const _CompileController = {
     }
   },
 
+  // Keep in sync with the logic for zip files in ProjectDownloadsController
   _getSafeProjectName(project) {
     return project.name.replace(/[^\p{L}\p{Nd}]/gu, '_')
   },
diff --git a/services/web/app/src/Features/Downloads/ProjectDownloadsController.mjs b/services/web/app/src/Features/Downloads/ProjectDownloadsController.mjs
index 6bd239b273..36aafda8c9 100644
--- a/services/web/app/src/Features/Downloads/ProjectDownloadsController.mjs
+++ b/services/web/app/src/Features/Downloads/ProjectDownloadsController.mjs
@@ -18,6 +18,11 @@ import { prepareZipAttachment } from '../../infrastructure/Response.js'
 
 let ProjectDownloadsController
 
+// Keep in sync with the logic for PDF files in CompileController
+function getSafeProjectName(project) {
+  return project.name.replace(/[^\p{L}\p{Nd}]/gu, '_')
+}
+
 export default ProjectDownloadsController = {
   downloadProject(req, res, next) {
     const projectId = req.params.Project_id
@@ -41,7 +46,7 @@ export default ProjectDownloadsController = {
                 if (error != null) {
                   return next(error)
                 }
-                prepareZipAttachment(res, `${project.name}.zip`)
+                prepareZipAttachment(res, `${getSafeProjectName(project)}.zip`)
                 return stream.pipe(res)
               }
             )
diff --git a/services/web/test/unit/src/Downloads/ProjectDownloadsController.test.mjs b/services/web/test/unit/src/Downloads/ProjectDownloadsController.test.mjs
index 1e339097fa..f3737df0ab 100644
--- a/services/web/test/unit/src/Downloads/ProjectDownloadsController.test.mjs
+++ b/services/web/test/unit/src/Downloads/ProjectDownloadsController.test.mjs
@@ -52,7 +52,7 @@ describe('ProjectDownloadsController', function () {
         .stub()
         .callsArgWith(1, null, ctx.stream)
       ctx.req.params = { Project_id: ctx.project_id }
-      ctx.project_name = 'project name with accênts'
+      ctx.project_name = 'project name with accênts and % special characters'
       ctx.ProjectGetter.getProject = sinon
         .stub()
         .callsArgWith(2, null, { name: ctx.project_name })
@@ -95,9 +95,9 @@ describe('ProjectDownloadsController', function () {
         .should.equal(true)
     })
 
-    it('should name the downloaded file after the project', function (ctx) {
+    it('should name the downloaded file after the project but sanitise special characters', function (ctx) {
       ctx.res.headers.should.deep.equal({
-        'Content-Disposition': `attachment; filename="${ctx.project_name}.zip"`,
+        'Content-Disposition': `attachment; filename="project_name_with_accênts_and___special_characters.zip"`,
         'Content-Type': 'application/zip',
         'X-Content-Type-Options': 'nosniff',
       })