diff --git a/src/browser/base/zen-components/ZenViewSplitter.mjs b/src/browser/base/zen-components/ZenViewSplitter.mjs
index 07cb872cf..c0d779092 100644
--- a/src/browser/base/zen-components/ZenViewSplitter.mjs
+++ b/src/browser/base/zen-components/ZenViewSplitter.mjs
@@ -1550,7 +1550,7 @@ class ZenViewSplitter extends ZenDOMOperatedFeature {
     const containerRect = this.fakeBrowser.getBoundingClientRect();
     const padding = Services.prefs.getIntPref('zen.theme.content-element-separation', 0);
     const dropTarget = document.elementFromPoint(
-      side == 'left' ? containerRect.left + containerRect.width + padding + 5 : containerRect.left - padding - 5,
+      dropSide === 'left' ? containerRect.left + containerRect.width + padding + 5 : containerRect.left - padding - 5,
       event.clientY
     );
     const browser = dropTarget?.closest('browser');