diff --git a/llvm/lib/CodeGen/RegisterScavenging.cpp b/llvm/lib/CodeGen/RegisterScavenging.cpp
index a55953f82f076d..c0a07ec4c91d18 100644
--- a/llvm/lib/CodeGen/RegisterScavenging.cpp
+++ b/llvm/lib/CodeGen/RegisterScavenging.cpp
@@ -495,10 +495,11 @@ RegScavenger::spill(Register Reg, const TargetRegisterClass &RC, int SPAdj,
     // Spill the scavenged register before \p Before.
     int FI = Scavenged[SI].FrameIndex;
     if (FI < FIB || FI >= FIE) {
-      std::string Msg = std::string("Error while trying to spill ") +
-          TRI->getName(Reg) + " from class " + TRI->getRegClassName(&RC) +
-          ": Cannot scavenge register without an emergency spill slot!";
-      report_fatal_error(Msg.c_str());
+      report_fatal_error(Twine("Error while trying to spill ") +
+                         TRI->getName(Reg) + " from class " +
+                         TRI->getRegClassName(&RC) +
+                         ": Cannot scavenge register without an emergency "
+                         "spill slot!");
     }
     TII->storeRegToStackSlot(*MBB, Before, Reg, true, FI, &RC, TRI);
     MachineBasicBlock::iterator II = std::prev(Before);