diff --git a/clang/lib/AST/ODRHash.cpp b/clang/lib/AST/ODRHash.cpp
index 27fdca1..1f9ff9e 100644
--- a/clang/lib/AST/ODRHash.cpp
+++ b/clang/lib/AST/ODRHash.cpp
@@ -857,6 +857,13 @@
 
   void VisitAutoType(const AutoType *T) {
     ID.AddInteger((unsigned)T->getKeyword());
+    ID.AddInteger(T->isConstrained());
+    if (T->isConstrained()) {
+      AddDecl(T->getTypeConstraintConcept());
+      ID.AddInteger(T->getNumArgs());
+      for (const auto &TA : T->getTypeConstraintArguments())
+        Hash.AddTemplateArgument(TA);
+    }
     VisitDeducedType(T);
   }