1 files changed, 4 insertions, 0 deletions
diff --git a/lib/Serialization/ASTReader.cpp b/lib/Serialization/ASTReader.cpp
index 478217bd03..9fe6ef317e 100644
--- a/lib/Serialization/ASTReader.cpp
+++ b/lib/Serialization/ASTReader.cpp
@@ -1661,6 +1661,10 @@ ASTReader::ReadASTBlock(ModuleFile &F) {
         return Failure;
       }
 
+      DeclContext *DC = Context.getTranslationUnitDecl();
+      if (!DC->hasExternalVisibleStorage() && DC->hasExternalLexicalStorage())
+        DC->setMustBuildLookupTable();
+
       return Success;
     }