diff --git a/ghost/admin/app/styles/patterns/forms.css b/ghost/admin/app/styles/patterns/forms.css
index 4eba90853a..bf0a74b085 100644
--- a/ghost/admin/app/styles/patterns/forms.css
+++ b/ghost/admin/app/styles/patterns/forms.css
@@ -225,7 +225,7 @@ select {
 .gh-select.error,
 .error .gh-input-append,
 select.error {
-    border-color: var(--red);
+    border-color: var(--red)!important;
 }
 
 .gh-input:focus,
diff --git a/ghost/admin/app/validators/post.js b/ghost/admin/app/validators/post.js
index f157e4d2f6..24da716349 100644
--- a/ghost/admin/app/validators/post.js
+++ b/ghost/admin/app/validators/post.js
@@ -62,12 +62,11 @@ export default BaseValidator.create({
 
     customExcerpt(model) {
         if (!validator.isLength(model.customExcerpt || '', 0, 300)) {
-            if (model.feature.editorExcerpt) {
-                model.errors.add('customExcerpt', 'Excerpt cannot be longer than 300 characters.');
-            } else {
-                model.errors.add('customExcerpt', 'Excerpt cannot be longer than 300 characters.');
-            }
+            const errorMessage = 'Excerpt cannot be longer than 300 characters.';
+            model.errors.add('customExcerpt', errorMessage);
             this.invalidate();
+        } else {
+            model.errors.remove('customExcerpt');
         }
     },