diff --git a/compiler-rt/lib/scudo/standalone/tsd_exclusive.h b/compiler-rt/lib/scudo/standalone/tsd_exclusive.h
index bba0c277c6a706..cf607d82d53e2a 100644
--- a/compiler-rt/lib/scudo/standalone/tsd_exclusive.h
+++ b/compiler-rt/lib/scudo/standalone/tsd_exclusive.h
@@ -15,7 +15,7 @@ namespace scudo {
 
 struct ThreadState {
   bool DisableMemInit : 1;
-  enum {
+  enum : unsigned {
     NotInitialized = 0,
     Initialized,
     TornDown,