diff --git a/build/org.eclipse.cdt.managedbuilder.ui/src/org/eclipse/cdt/managedbuilder/ui/properties/FileListControlFieldEditor.java b/build/org.eclipse.cdt.managedbuilder.ui/src/org/eclipse/cdt/managedbuilder/ui/properties/FileListControlFieldEditor.java
index a50836daa13..a7c265df22f 100644
--- a/build/org.eclipse.cdt.managedbuilder.ui/src/org/eclipse/cdt/managedbuilder/ui/properties/FileListControlFieldEditor.java
+++ b/build/org.eclipse.cdt.managedbuilder.ui/src/org/eclipse/cdt/managedbuilder/ui/properties/FileListControlFieldEditor.java
@@ -152,7 +152,7 @@ public class FileListControlFieldEditor extends FieldEditor {
 		layout.marginHeight = 0;
 		layout.makeColumnsEqualWidth = false;
 		topLayout.setLayout(layout);
-		GridData gddata = new GridData(GridData.FILL_HORIZONTAL);
+		GridData gddata = new GridData(GridData.FILL_BOTH);
 		gddata.horizontalSpan = 2;
 		topLayout.setLayoutData(gddata);
 		// file list control