diff --git a/llvm/lib/ExecutionEngine/Orc/Layer.cpp b/llvm/lib/ExecutionEngine/Orc/Layer.cpp
--- a/llvm/lib/ExecutionEngine/Orc/Layer.cpp
+++ b/llvm/lib/ExecutionEngine/Orc/Layer.cpp
@@ -51,7 +51,7 @@
 StringRef IRMaterializationUnit::getName() const {
   if (TSM)
     return TSM.withModuleDo(
-        [](const Module &M) { return M.getModuleIdentifier(); });
+        [](const Module &M) -> StringRef { return M.getModuleIdentifier(); });
   return "<null module>";
 }