diff --git a/chrome/content/zotero-platform/unix/overlay.css b/chrome/content/zotero-platform/unix/overlay.css
index ca2f342dc4..3500fe8597 100644
--- a/chrome/content/zotero-platform/unix/overlay.css
+++ b/chrome/content/zotero-platform/unix/overlay.css
@@ -124,10 +124,4 @@
 
 #zotero-tb-search .textbox-search-icon {
 	visibility: hidden;
-}
-
-/* As of Fx37, the tree doesn't scale HiDPI images properly on Linux */
-#zotero-collections-tree treechildren::-moz-tree-image,
-#zotero-items-tree treechildren::-moz-tree-image {
-	height: 16px;
 }
\ No newline at end of file
diff --git a/chrome/skin/default/zotero/overlay.css b/chrome/skin/default/zotero/overlay.css
index faf9df9416..22e8828849 100644
--- a/chrome/skin/default/zotero/overlay.css
+++ b/chrome/skin/default/zotero/overlay.css
@@ -24,6 +24,12 @@
 	min-height: 5.2em;
 }
 
+/* As of Fx37, the tree doesn't scale HiDPI images properly on Windows and Linux */
+#zotero-collections-tree treechildren::-moz-tree-image,
+#zotero-items-tree treechildren::-moz-tree-image {
+	height: 16px;
+}
+
 #zotero-collections-tree treechildren::-moz-tree-image(primary)
 {
 	margin-right: 5px;