diff --git a/resources/sass/_tinymce.scss b/resources/sass/_tinymce.scss
index 132c3ce7f..29843e424 100644
--- a/resources/sass/_tinymce.scss
+++ b/resources/sass/_tinymce.scss
@@ -21,7 +21,7 @@
   padding-block-end: 1rem;
   outline: 0;
   display: block;
-  max-width: calc(870px);
+  max-width: 870px;
 }
 
 .wysiwyg-input.mce-content-body {