diff --git a/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/core/parser/util/ICharArrayMap.java b/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/core/parser/util/ICharArrayMap.java
index 1bf724dd365..58a0f6dbc77 100644
--- a/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/core/parser/util/ICharArrayMap.java
+++ b/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/core/parser/util/ICharArrayMap.java
@@ -97,6 +97,11 @@ public interface ICharArrayMap<V> {
 	 */
 	Collection<V> values();
 
+	/**
+	 * Returns the keys stored in the map.
+	 */
+	Collection<char[]> keys();
+	
 	/**
 	 * Removes all mappings from the map.
 	 */