diff --git a/llvm/lib/ExecutionEngine/RuntimeDyld/RuntimeDyld.cpp b/llvm/lib/ExecutionEngine/RuntimeDyld/RuntimeDyld.cpp
--- a/llvm/lib/ExecutionEngine/RuntimeDyld/RuntimeDyld.cpp
+++ b/llvm/lib/ExecutionEngine/RuntimeDyld/RuntimeDyld.cpp
@@ -836,7 +836,7 @@
       // Align DataSize to stub alignment if we have any stubs (PaddingSize will
       // have been increased above to account for this).
       if (StubBufSize > 0)
-        DataSize &= ~(getStubAlignment() - 1);
+        DataSize &= ~(getStubAlignment() - 1UL);
     }
 
     LLVM_DEBUG(dbgs() << "emitSection SectionID: " << SectionID << " Name: "