diff --git a/platform/org.eclipse.platform/css/e4_default_mac.css b/platform/org.eclipse.platform/css/e4_default_mac.css
index ca617bb..3b5982f 100644
--- a/platform/org.eclipse.platform/css/e4_default_mac.css
+++ b/platform/org.eclipse.platform/css/e4_default_mac.css
@@ -5,7 +5,6 @@
 }
 
 .MPartStack {
-	font-size: 12;
 	swt-simple: false;
 	swt-mru-visible: false;
 }