diff --git a/CHANGELOG b/CHANGELOG
index 7763a5d11..fc285a0bc 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -18,6 +18,7 @@ Motions:
 - Removed server side image to base64 transformation and
   added local transformation [#2705]
 - Added support for export motions in a zip archive [#3189].
+- Bugfix: changing motion line length did not invalidate cache [#3202]
 
 Core:
 - No reload on logoff. OpenSlides is now a full single page
diff --git a/openslides/motions/static/js/motions/linenumbering.js b/openslides/motions/static/js/motions/linenumbering.js
index f7aa9a90a..93faed1e9 100644
--- a/openslides/motions/static/js/motions/linenumbering.js
+++ b/openslides/motions/static/js/motions/linenumbering.js
@@ -475,7 +475,7 @@ angular.module('OpenSlidesApp.motions.lineNumbering', [])
                 newRoot = this.insertLineNumbersNode(html, lineLength, highlight, firstLine);
                 newHtml = newRoot.innerHTML;
             } else {
-                var cacheKey = this.djb2hash(html);
+                var cacheKey = this.djb2hash(lineLength.toString() + html);
                 newHtml = lineNumberCache.get(cacheKey);
 
                 if (angular.isUndefined(newHtml)) {
diff --git a/tests/karma/motions/linenumbering.service.test.js b/tests/karma/motions/linenumbering.service.test.js
index e1b57d30e..4c905b190 100644
--- a/tests/karma/motions/linenumbering.service.test.js
+++ b/tests/karma/motions/linenumbering.service.test.js
@@ -389,4 +389,13 @@ describe('linenumbering', function () {
         expect(highlighted).toBe(noMarkup(1) + '<span>Lorem ' + brMarkup(2) + 'ipsum ' + brMarkup(3) + 'dolor' + brMarkup(4) + 'sit ' + brMarkup(5) + 'amet</span>');
     });
   });
+
+  describe('caching', function() {
+    it('caches based on line length', function () {
+      var inHtml = '<p>' +longstr(100) + '</p>';
+      var outHtml80 = lineNumberingService.insertLineNumbers(inHtml, 80);
+      var outHtml70 = lineNumberingService.insertLineNumbers(inHtml, 70);
+      expect(outHtml70).not.toBe(outHtml80);
+    });
+  });
 });