diff --git a/main/webapp/modules/core/scripts/dialogs/expression-preview-dialog.html b/main/webapp/modules/core/scripts/dialogs/expression-preview-dialog.html
index 258cfadd8..e5a6a10c4 100644
--- a/main/webapp/modules/core/scripts/dialogs/expression-preview-dialog.html
+++ b/main/webapp/modules/core/scripts/dialogs/expression-preview-dialog.html
@@ -5,7 +5,7 @@
     <td colspan="2"><select bind="expressionPreviewLanguageSelect">$LANGUAGE_OPTIONS$</select></td>
   </tr>
   <tr>
-    <td colspan="3"><div class="input-container"><textarea class="expression-preview-code" bind="expressionPreviewTextarea" /></div></td>
+    <td colspan="3"><div class="input-container"><textarea class="expression-preview-code" bind="expressionPreviewTextarea" spellcheck="false" /></div></td>
     <td class="expression-preview-parsing-status" bind="expressionPreviewParsingStatus" width="150" style="vertical-align: top;"></td>
   </tr>
   <tr>