diff --git a/src/vs/base/browser/ui/sash/sash.css b/src/vs/base/browser/ui/sash/sash.css
index fdcbc26609e..42b0f425787 100644
--- a/src/vs/base/browser/ui/sash/sash.css
+++ b/src/vs/base/browser/ui/sash/sash.css
@@ -5,6 +5,7 @@
 
 :root {
 	--vscode-sash-size: 4px;
+	--vscode-sash-hover-size: 4px;
 }
 
 .monaco-sash {