diff --git a/lib/Target/PowerPC/PPCISelLowering.cpp b/lib/Target/PowerPC/PPCISelLowering.cpp
index d2fd3cd8622..09569a89921 100644
--- a/lib/Target/PowerPC/PPCISelLowering.cpp
+++ b/lib/Target/PowerPC/PPCISelLowering.cpp
@@ -153,7 +153,8 @@ PPCTargetLowering::PPCTargetLowering(TargetMachine &TM)
   setOperationAction(ISD::STACKSAVE         , MVT::Other, Expand); 
   setOperationAction(ISD::STACKRESTORE      , MVT::Other, Expand);
   setOperationAction(ISD::DYNAMIC_STACKALLOC, MVT::i32  , Expand);
-  
+  setOperationAction(ISD::DYNAMIC_STACKALLOC, MVT::i64  , Expand);
+
   // We want to custom lower some of our intrinsics.
   setOperationAction(ISD::INTRINSIC_WO_CHAIN, MVT::Other, Custom);