diff --git a/chrome/skin/default/zotero/overlay.css b/chrome/skin/default/zotero/overlay.css
index b4f11a631f..7e3ddb63ab 100644
--- a/chrome/skin/default/zotero/overlay.css
+++ b/chrome/skin/default/zotero/overlay.css
@@ -192,6 +192,10 @@ TODO: Replace with SVG
 #zotero-layout-switcher[orient="vertical"],
 #zotero-layout-switcher[orient="vertical"] :is(#zotero-items-pane-container, #zotero-item-pane) {
 	width: auto !important;
+	/* min-width: 0 is required here to allow the pane to shrink in Stacked view,
+	   but the child #zotero-items-pane sets a larger min-width, and the splitter
+	   follows that instead of this. */
+	min-width: 0 !important;
 }
 
 /*