diff --git a/llvm/unittests/Analysis/AliasAnalysisTest.cpp b/llvm/unittests/Analysis/AliasAnalysisTest.cpp
index 7a84257..a1a020f 100644
--- a/llvm/unittests/Analysis/AliasAnalysisTest.cpp
+++ b/llvm/unittests/Analysis/AliasAnalysisTest.cpp
@@ -166,7 +166,7 @@
   // Setup function.
   FunctionType *FTy =
       FunctionType::get(Type::getVoidTy(C), std::vector<Type *>(), false);
-  auto *F = cast<Function>(M.getOrInsertFunction("f", FTy));
+  auto *F = Function::Create(FTy, Function::ExternalLinkage, "f", M);
   auto *BB = BasicBlock::Create(C, "entry", F);
   auto IntType = Type::getInt32Ty(C);
   auto PtrType = Type::getInt32PtrTy(C);