Index: source/Symbol/ClangASTImporter.cpp
===================================================================
--- source/Symbol/ClangASTImporter.cpp
+++ source/Symbol/ClangASTImporter.cpp
@@ -1052,6 +1052,15 @@
 
     to_tag_decl->setHasExternalLexicalStorage();
     to_tag_decl->getPrimaryContext()->setMustBuildLookupTable();
+    if (!to_tag_decl->getPrimaryContext()->isTransparentContext())
+      if (to_tag_decl->isCompleteDefinition())
+        to_tag_decl->buildLookup();
+
+    DeclContext *redecl_primary_ctx =
+        to_tag_decl->getRedeclContext()->getPrimaryContext();
+    redecl_primary_ctx->setMustBuildLookupTable();
+    if (to_tag_decl->isCompleteDefinition())
+      redecl_primary_ctx->buildLookup();
 
     if (log)
       log->Printf(