diff --git a/app/assets/javascripts/editor/evaluation.js.erb b/app/assets/javascripts/editor/evaluation.js.erb
index 19f57ce3..feced0eb 100644
--- a/app/assets/javascripts/editor/evaluation.js.erb
+++ b/app/assets/javascripts/editor/evaluation.js.erb
@@ -152,23 +152,23 @@ CodeOceanEditorEvaluation = {
     var element = this.findOrCreateOutputElement(index);
     if (!colorize) {
       if (output.stdout != undefined && output.stdout != '') {
-        element.append(output.stdout)
-        //element.text(element.text() + output.stdout)
+        //element.append(output.stdout)
+        element.text(element.text() + output.stdout)
       }
 
       if (output.stderr != undefined && output.stderr != '') {
-          element.append('StdErr: ' + output.stderr);
-        //element.text('StdErr: ' + element.text() + output.stderr);
+        //element.append('StdErr: ' + output.stderr);
+        element.text('StdErr: ' + element.text() + output.stderr);
       }
 
     } else if (output.stderr) {
-        element.addClass('text-warning').append(output.stderr);
-        //element.addClass('text-warning').text(element.text() + output.stderr);
+        //element.addClass('text-warning').append(output.stderr);
+        element.addClass('text-warning').text(element.text() + output.stderr);
       this.flowrOutputBuffer += output.stderr;
       this.QaApiOutputBuffer.stderr += output.stderr;
     } else if (output.stdout) {
-        element.addClass('text-success').append(output.stdout);
-        //element.addClass('text-success').text(element.text() + output.stdout);
+        //element.addClass('text-success').append(output.stdout);
+        element.addClass('text-success').text(element.text() + output.stdout);
       this.flowrOutputBuffer += output.stdout;
       this.QaApiOutputBuffer.stdout += output.stdout;
     } else {