diff --git a/llvm/lib/Target/SystemZ/SystemZInstrInfo.cpp b/llvm/lib/Target/SystemZ/SystemZInstrInfo.cpp
index 0e2ed59..16ffd04 100644
--- a/llvm/lib/Target/SystemZ/SystemZInstrInfo.cpp
+++ b/llvm/lib/Target/SystemZ/SystemZInstrInfo.cpp
@@ -727,7 +727,7 @@
   return true;
 }
 
-bool SystemZInstrInfo::isPredicable(MachineInstr &MI) const {
+bool SystemZInstrInfo::isPredicable(const MachineInstr &MI) const {
   unsigned Opcode = MI.getOpcode();
   if (Opcode == SystemZ::Return ||
       Opcode == SystemZ::Trap ||