diff --git a/lib/Target/Alpha/AlphaInstrInfo.cpp b/lib/Target/Alpha/AlphaInstrInfo.cpp
index 203c7b1..76a594f 100644
--- a/lib/Target/Alpha/AlphaInstrInfo.cpp
+++ b/lib/Target/Alpha/AlphaInstrInfo.cpp
@@ -473,6 +473,7 @@
   bool Ok = TII->copyRegToReg(FirstMBB, MBBI, GlobalBaseReg, Alpha::R29,
                               &Alpha::GPRCRegClass, &Alpha::GPRCRegClass);
   assert(Ok && "Couldn't assign to global base register!");
+  Ok = Ok; // Silence warning when assertions are turned off.
   RegInfo.addLiveIn(Alpha::R29);
 
   AlphaFI->setGlobalBaseReg(GlobalBaseReg);
@@ -499,6 +500,7 @@
   bool Ok = TII->copyRegToReg(FirstMBB, MBBI, GlobalRetAddr, Alpha::R26,
                               &Alpha::GPRCRegClass, &Alpha::GPRCRegClass);
   assert(Ok && "Couldn't assign to global return address register!");
+  Ok = Ok; // Silence warning when assertions are turned off.
   RegInfo.addLiveIn(Alpha::R26);
 
   AlphaFI->setGlobalRetAddr(GlobalRetAddr);