diff --git a/src/services/services.ts b/src/services/services.ts
index 58d5357eddb..058ae3e72cf 100644
--- a/src/services/services.ts
+++ b/src/services/services.ts
@@ -5490,7 +5490,7 @@ namespace ts {
 
                     const nameTable = getNameTable(sourceFile);
 
-                    if (lookUp(nameTable, internedName)) {
+                    if (lookUp(nameTable, internedName) !== undefined) {
                         result = result || [];
                         getReferencesInNode(sourceFile, symbol, declaredName, node, searchMeaning, findInStrings, findInComments, result, symbolToIndex);
                     }