diff --git a/core/org.eclipse.cdt.core/ChangeLog b/core/org.eclipse.cdt.core/ChangeLog
index f381fe94945..9e491a73394 100644
--- a/core/org.eclipse.cdt.core/ChangeLog
+++ b/core/org.eclipse.cdt.core/ChangeLog
@@ -1,3 +1,6 @@
+2004-02-22 John Camelon
+	Fixed CModelManager.isValidTranslationUnitName() regression.  
+
 2004-02-21 Alain Magloire
 
 	Refactor the ICPathEntry to IPathEntry for consistency.
diff --git a/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/model/CModelManager.java b/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/model/CModelManager.java
index 288dde158bb..05d76aac387 100644
--- a/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/model/CModelManager.java
+++ b/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/model/CModelManager.java
@@ -505,7 +505,7 @@ public class CModelManager implements IResourceChangeListener {
 			return false;
 		}
 		String ext = name.substring(index + 1);
-		String[] cexts = getHeaderExtensions();
+		String[] cexts = getTranslationUnitExtensions();
 		for (int i = 0; i < cexts.length; i++) {
 			if (ext.equals(cexts[i]))
 				return true;