diff --git a/lib/Target/ARM64/ARM64InstrInfo.td b/lib/Target/ARM64/ARM64InstrInfo.td
index 69f1e2c5a6d..5bb57c5092b 100644
--- a/lib/Target/ARM64/ARM64InstrInfo.td
+++ b/lib/Target/ARM64/ARM64InstrInfo.td
@@ -399,7 +399,7 @@ def MOVi64imm
 // eventual expansion code fewer bits to worry about getting right. Marshalling
 // the types is a little tricky though:
 def i64imm_32bit : ImmLeaf<i64, [{
-  return (Imm & 0xffffffffULL) == Imm;
+  return (Imm & 0xffffffffULL) == static_cast<uint64_t>(Imm);
 }]>;
 
 def trunc_imm : SDNodeXForm<imm, [{