diff --git a/core/org.eclipse.cdt.core/src/org/eclipse/cdt/internal/core/CProjectDescriptor.java b/core/org.eclipse.cdt.core/src/org/eclipse/cdt/internal/core/CProjectDescriptor.java
index e3c08ada45c..4e06e51eb4b 100644
--- a/core/org.eclipse.cdt.core/src/org/eclipse/cdt/internal/core/CProjectDescriptor.java
+++ b/core/org.eclipse.cdt.core/src/org/eclipse/cdt/internal/core/CProjectDescriptor.java
@@ -49,7 +49,7 @@ public class CProjectDescriptor implements ICProjectDescriptor {
 
 	private String builderID;
 	
-	private static final String PROJECT_DESCRIPTION = "cdtProject";
+	private static final String PROJECT_DESCRIPTION = ".cdtproject";
 
 	private CProjectDescriptor(IProject project, String id) throws CoreException {
 		this.project = project;