diff --git a/gerrit-gwtui/src/main/java/com/google/gerrit/client/diff/SideBySide2.java b/gerrit-gwtui/src/main/java/com/google/gerrit/client/diff/SideBySide2.java
index 52bc10913d..035f34a9ca 100644
--- a/gerrit-gwtui/src/main/java/com/google/gerrit/client/diff/SideBySide2.java
+++ b/gerrit-gwtui/src/main/java/com/google/gerrit/client/diff/SideBySide2.java
@@ -1242,7 +1242,7 @@ public class SideBySide2 extends Screen {
     int rest = Gerrit.getHeaderFooterHeight()
         + header.getOffsetHeight()
         + diffTable.getHeaderHeight()
-        + 10; // Estimate
+        + 5; // Estimate
     int h = Window.getClientHeight() - rest;
     cmA.setHeight(h);
     cmB.setHeight(h);