diff --git a/clang/lib/Sema/SemaChecking.cpp b/clang/lib/Sema/SemaChecking.cpp
index 4660ed5..bdc942c 100644
--- a/clang/lib/Sema/SemaChecking.cpp
+++ b/clang/lib/Sema/SemaChecking.cpp
@@ -7135,6 +7135,8 @@
                                       const char *startSpecifier,
                                       unsigned specifierLen) override;
 
+  void handleInvalidMaskType(StringRef MaskType) override;
+
   bool HandlePrintfSpecifier(const analyze_printf::PrintfSpecifier &FS,
                              const char *startSpecifier,
                              unsigned specifierLen) override;
@@ -7186,6 +7188,10 @@
                                           CS.getStart(), CS.getLength());
 }
 
+void CheckPrintfHandler::handleInvalidMaskType(StringRef MaskType) {
+  S.Diag(getLocationOfByte(MaskType.data()), diag::err_invalid_mask_type_size);
+}
+
 bool CheckPrintfHandler::HandleAmount(
                                const analyze_format_string::OptionalAmount &Amt,
                                unsigned k, const char *startSpecifier,