diff --git a/lib/Transforms/Scalar/InductiveRangeCheckElimination.cpp b/lib/Transforms/Scalar/InductiveRangeCheckElimination.cpp
index dd0c9fd80d1..81379653d5d 100644
--- a/lib/Transforms/Scalar/InductiveRangeCheckElimination.cpp
+++ b/lib/Transforms/Scalar/InductiveRangeCheckElimination.cpp
@@ -104,7 +104,7 @@ namespace {
 ///
 class InductiveRangeCheck {
   // Classifies a range check
-  enum RangeCheckKind {
+  enum RangeCheckKind : unsigned {
     // Range check of the form "0 <= I".
     RANGE_CHECK_LOWER = 1,