diff --git a/core/org.eclipse.cdt.ui/src/org/eclipse/cdt/internal/ui/refactoring/includes/IncludePreferences.java b/core/org.eclipse.cdt.ui/src/org/eclipse/cdt/internal/ui/refactoring/includes/IncludePreferences.java
index 57f11d845f8..c5cf3da7682 100644
--- a/core/org.eclipse.cdt.ui/src/org/eclipse/cdt/internal/ui/refactoring/includes/IncludePreferences.java
+++ b/core/org.eclipse.cdt.ui/src/org/eclipse/cdt/internal/ui/refactoring/includes/IncludePreferences.java
@@ -177,6 +177,7 @@ public class IncludePreferences implements Comparator<StyledInclude> {
 		store.setDefault(PreferenceConstants.FORWARD_DECLARE_COMPOSITE_TYPES, true);
 		store.setDefault(PreferenceConstants.FORWARD_DECLARE_ENUMS, false);
 		store.setDefault(PreferenceConstants.FORWARD_DECLARE_FUNCTIONS, false);
+		store.setDefault(PreferenceConstants.FORWARD_DECLARE_EXTERNAL_VARIABLES, false);
 		store.setDefault(PreferenceConstants.FORWARD_DECLARE_TEMPLATES, false);
 		store.setDefault(PreferenceConstants.FORWARD_DECLARE_NAMESPACE_ELEMENTS, true);
 		store.setDefault(PreferenceConstants.INCLUDES_UNUSED_STATEMENTS_DISPOSITION,