diff --git a/lib/Target/Lanai/LanaiInstrInfo.td b/lib/Target/Lanai/LanaiInstrInfo.td
index 7565920f1f2..70da0d35370 100644
--- a/lib/Target/Lanai/LanaiInstrInfo.td
+++ b/lib/Target/Lanai/LanaiInstrInfo.td
@@ -133,7 +133,7 @@ def i32neg16 : Operand<i32>, PatLeaf<(i32 imm), [{
 def i32lo16s : Operand<i32>, PatLeaf<(i32 imm), [{
     // i32lo16 predicate - true if the 32-bit immediate has only rightmost 16
     // bits set.
-    return ((N->getSExtValue() & 0xFFFFUL) == N->getSExtValue());}], LO16> {
+    return ((int64_t)(N->getSExtValue() & 0xFFFFUL) == N->getSExtValue());}], LO16> {
   let ParserMatchClass = LoImm16AsmOperand;
 }