diff --git a/lib/Support/APInt.cpp b/lib/Support/APInt.cpp
index ef35e1c..e13011f 100644
--- a/lib/Support/APInt.cpp
+++ b/lib/Support/APInt.cpp
@@ -1113,7 +1113,7 @@
   // issues in the algorithm below.
   if (shiftAmt == BitWidth) {
     if (isNegative())
-      return APInt(BitWidth, -1ULL);
+      return APInt(BitWidth, -1ULL, true);
     else
       return APInt(BitWidth, 0);
   }