diff --git a/lib/Sema/SemaExpr.cpp b/lib/Sema/SemaExpr.cpp
index 1590e22..473ecef 100644
--- a/lib/Sema/SemaExpr.cpp
+++ b/lib/Sema/SemaExpr.cpp
@@ -5357,6 +5357,7 @@
   BSI->ReturnType = QualType();
   BSI->TheScope = BlockScope;
   BSI->hasBlockDeclRefExprs = false;
+  BSI->hasPrototype = false;
   BSI->SavedFunctionNeedsScopeChecking = CurFunctionNeedsScopeChecking;
   CurFunctionNeedsScopeChecking = false;