diff --git a/src/libs/cplusplus/CppDocument.cpp b/src/libs/cplusplus/CppDocument.cpp
index cb4630d9c9c..a72648b8ba2 100644
--- a/src/libs/cplusplus/CppDocument.cpp
+++ b/src/libs/cplusplus/CppDocument.cpp
@@ -1115,6 +1115,8 @@ void CPlusPlus::findMatchingDeclaration(const LookupContext &context,
     if (qName) {
         if (qName->base())
             binding = context.lookupType(qName->base(), enclosingScope);
+        else
+            binding = context.globalNamespace();
         functionName = qName->name();
     }