diff --git a/lib/Target/AMDGPU/AMDGPUMCInstLower.cpp b/lib/Target/AMDGPU/AMDGPUMCInstLower.cpp
index 1d8fc70fe3d..c15b37f9e9c 100644
--- a/lib/Target/AMDGPU/AMDGPUMCInstLower.cpp
+++ b/lib/Target/AMDGPU/AMDGPUMCInstLower.cpp
@@ -230,7 +230,7 @@ void AMDGPUAsmPrinter::EmitInstruction(const MachineInstr *MI) {
         const MCSymbolRefExpr *Expr
           = MCSymbolRefExpr::create(MBB->getSymbol(), OutContext);
         Expr->print(Str, MAI);
-        OutStreamer->emitRawComment(" mask branch " + BBStr);
+        OutStreamer->emitRawComment(Twine(" mask branch ") + BBStr);
       }
 
       return;