diff --git a/llvm/lib/CodeGen/MachineOutliner.cpp b/llvm/lib/CodeGen/MachineOutliner.cpp
index 1a0190c..8c06260 100644
--- a/llvm/lib/CodeGen/MachineOutliner.cpp
+++ b/llvm/lib/CodeGen/MachineOutliner.cpp
@@ -1104,9 +1104,9 @@
 
   // Create the function using an IR-level function.
   LLVMContext &C = M.getContext();
-  Function *F = dyn_cast<Function>(
-      M.getOrInsertFunction(NameStream.str(), Type::getVoidTy(C)));
-  assert(F && "Function was null!");
+  Function *F =
+      Function::Create(FunctionType::get(Type::getVoidTy(C), false),
+                       Function::ExternalLinkage, NameStream.str(), M);
 
   // NOTE: If this is linkonceodr, then we can take advantage of linker deduping
   // which gives us better results when we outline from linkonceodr functions.