diff --git a/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/pdom/indexer/PDOMIndexerTask.java b/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/pdom/indexer/PDOMIndexerTask.java
index eb4e5599424..eae29f620ec 100644
--- a/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/pdom/indexer/PDOMIndexerTask.java
+++ b/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/pdom/indexer/PDOMIndexerTask.java
@@ -194,7 +194,7 @@ public abstract class PDOMIndexerTask extends PDOMWriter implements IPDOMIndexer
 			long start= System.currentTimeMillis();
 			IASTTranslationUnit ast= createAST(tu, pm);
 			fStatistics.fParsingTime += System.currentTimeMillis()-start;
-			if (tu != null) {
+			if (ast != null) {
 				addSymbols(ast, index, readlockCount, pm);
 			}
 		}