diff --git a/resources/skins.vector.styles/components/VueEnhancedSearchBox.less b/resources/skins.vector.styles/components/VueEnhancedSearchBox.less
index dbcd37346..8a512e1a9 100644
--- a/resources/skins.vector.styles/components/VueEnhancedSearchBox.less
+++ b/resources/skins.vector.styles/components/VueEnhancedSearchBox.less
@@ -89,7 +89,7 @@
 		.transition( none );
 	}
 
-	.vector-search-box-show-thumbnail {
+	&.vector-search-box-show-thumbnail {
 		&.vector-search-box-auto-expand-width .searchButton {
 			// Accounts for the margin that allocates space for the input expanding and
 			// 1px input border.