diff --git a/llvm/lib/Target/Hexagon/HexagonFrameLowering.cpp b/llvm/lib/Target/Hexagon/HexagonFrameLowering.cpp
index 1d3d2ea8c557..e29dab266ab2 100644
--- a/llvm/lib/Target/Hexagon/HexagonFrameLowering.cpp
+++ b/llvm/lib/Target/Hexagon/HexagonFrameLowering.cpp
@@ -1372,7 +1372,7 @@ void HexagonFrameLowering::processFunctionBeforeFrameFinalized(
     unsigned A = std::max(MFI.getObjectAlignment(i), 8U);
     MFI.setObjectAlignment(i, 8);
     LFS = alignTo(LFS+S, A);
-    MFI.mapLocalFrameObject(i, -LFS);
+    MFI.mapLocalFrameObject(i, -static_cast<int64_t>(LFS));
   }
 
   MFI.setLocalFrameSize(LFS);