diff --git a/chrome/content/zotero/import/mendeley/mendeleyImport.js b/chrome/content/zotero/import/mendeley/mendeleyImport.js
index fdfdeadbd5..2d99e6d8e0 100644
--- a/chrome/content/zotero/import/mendeley/mendeleyImport.js
+++ b/chrome/content/zotero/import/mendeley/mendeleyImport.js
@@ -706,8 +706,18 @@ Zotero_Import_Mendeley.prototype._getDocumentFilesAPI = async function (document
 	for (let doc of documents) {
 		const files = [];
 		for (let file of (doc.files || [])) {
-			const fileName = Zotero.File.getValidFileName(file.file_name || 'file');
-			const tmpFile = OS.Path.join(Zotero.getTempDirectory().path, `m-api-${this.timestamp}-${file.id}`, fileName);
+			var fileName = Zotero.File.truncateFileName(Zotero.File.getValidFileName(file.file_name || 'file'), 255); // most filesystems limit filename to 255 characters
+			var tmpFile = OS.Path.join(Zotero.getTempDirectory().path, `m-api-${this.timestamp}-${file.id}`, fileName);
+			if (tmpFile.length >= 260) {
+				const surplus = tmpFile.length - 260;
+				if (surplus >= fileName.length) {
+					Zotero.logError(`File ${fileName} will be skipped due to path exceeding filesystem limits: ${tmpFile}`);
+					continue;
+				}
+				Zotero.debug(`${fileName} will be truncated by ${surplus} characters`);
+				fileName = Zotero.File.truncateFileName(fileName, fileName.length - surplus);
+				tmpFile = OS.Path.join(Zotero.getTempDirectory().path, `m-api-${this.timestamp}-${file.id}`, fileName);
+			}
 			this._tmpFilesToDelete.push(tmpFile);
 			caller.add(this._fetchFile.bind(this, file.id, tmpFile));
 			files.push({