1 files changed, 5 insertions, 0 deletions
diff --git a/clang/lib/Sema/SemaExprMember.cpp b/clang/lib/Sema/SemaExprMember.cpp
index 65e444915c3..3e7f8314d5d 100644
--- a/clang/lib/Sema/SemaExprMember.cpp
+++ b/clang/lib/Sema/SemaExprMember.cpp
@@ -1084,6 +1084,11 @@ Sema::LookupMemberExpr(LookupResult &R, ExprResult &BaseExpr,
       goto fail;
     }
 
+    if (RequireCompleteType(OpLoc, BaseType, 
+                            PDiag(diag::err_typecheck_incomplete_tag)
+                              << BaseExpr.get()->getSourceRange()))
+      return ExprError();
+    
     ObjCInterfaceDecl *ClassDeclared;
     ObjCIvarDecl *IV = IDecl->lookupInstanceVariable(Member, ClassDeclared);