diff --git a/clang/lib/AST/Interp/Boolean.h b/clang/lib/AST/Interp/Boolean.h
index e496f70eb4117..579842ce46aa0 100644
--- a/clang/lib/AST/Interp/Boolean.h
+++ b/clang/lib/AST/Interp/Boolean.h
@@ -64,7 +64,7 @@ class Boolean final {
 
   Boolean toUnsigned() const { return *this; }
 
-  constexpr static unsigned bitWidth() { return true; }
+  constexpr static unsigned bitWidth() { return 1; }
   bool isZero() const { return !V; }
   bool isMin() const { return isZero(); }