diff --git a/llvm/lib/Target/Alpha/AlphaISelLowering.cpp b/llvm/lib/Target/Alpha/AlphaISelLowering.cpp
index c6cfc4b..7e8e989 100644
--- a/llvm/lib/Target/Alpha/AlphaISelLowering.cpp
+++ b/llvm/lib/Target/Alpha/AlphaISelLowering.cpp
@@ -66,6 +66,8 @@
   setOperationAction(ISD::SEXTLOAD, MVT::i8,  Expand);
   setOperationAction(ISD::SEXTLOAD, MVT::i16, Expand);
   
+  setOperationAction(ISD::TRUNCSTORE, MVT::i1, Promote);
+
   setOperationAction(ISD::FREM, MVT::f32, Expand);
   setOperationAction(ISD::FREM, MVT::f64, Expand);