Index: clang/include/clang/AST/FormatString.h
--- clang/include/clang/AST/FormatString.h.orig
+++ clang/include/clang/AST/FormatString.h
@@ -253,8 +253,10 @@ class ConversionSpecifier { (public)
     return (kind >= IntArgBeg && kind <= IntArgEnd) || kind == FreeBSDrArg ||
            kind == FreeBSDyArg;
   }
-  bool isUIntArg() const { return kind >= UIntArgBeg && kind <= UIntArgEnd; }
-  bool isAnyIntArg() const { return kind >= IntArgBeg && kind <= UIntArgEnd; }
+  bool isUIntArg() const { return (kind >= UIntArgBeg && kind <= UIntArgEnd) ||
+    kind == FreeBSDbArg; }
+  bool isAnyIntArg() const { return (kind >= IntArgBeg && kind <= UIntArgEnd) ||
+    kind == FreeBSDbArg; }
   bool isDoubleArg() const {
     return kind >= DoubleArgBeg && kind <= DoubleArgEnd;
   }
