diff --git a/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/pdom/PDOM.java b/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/pdom/PDOM.java
index 9c2519c8dca..4f78b9f7a7d 100644
--- a/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/pdom/PDOM.java
+++ b/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/pdom/PDOM.java
@@ -954,7 +954,8 @@ public class PDOM extends PlatformObject implements IPDOM {
 				}
 			}
 		}
-		return cand == null;
+		// Toplevel anonymous namespaces are not part of the qualified name either.
+		return cand == null || (cand instanceof ICPPNamespace && cand.getNameCharArray().length == 0);
 	}
 
 	private long getFirstLinkageRecord() throws CoreException {