Index: llvm/lib/IR/AutoUpgrade.cpp
===================================================================
--- llvm/lib/IR/AutoUpgrade.cpp
+++ llvm/lib/IR/AutoUpgrade.cpp
@@ -743,7 +743,7 @@
     // address space.
     if (Name.startswith("objectsize.")) {
       Type *Tys[2] = { F->getReturnType(), F->arg_begin()->getType() };
-      if (F->arg_size() == 2 ||
+      if (F->arg_size() == 2 || F->arg_size() == 3 ||
           F->getName() != Intrinsic::getName(Intrinsic::objectsize, Tys)) {
         rename(F);
         NewFn = Intrinsic::getDeclaration(F->getParent(), Intrinsic::objectsize,
@@ -3461,7 +3461,7 @@
                                    ? Builder.getFalse()
                                    : CI->getArgOperand(2);
     Value *Dynamic =
-        CI->getNumArgOperands() < 3 ? Builder.getFalse() : CI->getArgOperand(3);
+        CI->getNumArgOperands() < 4 ? Builder.getFalse() : CI->getArgOperand(3);
     NewCall = Builder.CreateCall(
         NewFn, {CI->getArgOperand(0), CI->getArgOperand(1), NullIsUnknownSize, Dynamic});
     break;
Index: llvm/test/Bitcode/upgrade-objectsize.ll
===================================================================
--- /dev/null
+++ llvm/test/Bitcode/upgrade-objectsize.ll
@@ -0,0 +1,13 @@
+; RUN: opt -S < %s | FileCheck %s
+
+; Test to enssure that calls to llvm.objectsize are auto-upgraded to to add a
+; 'dynamic' parameter.
+
+define void @callit(i8* %ptr) {
+  %sz = call i64 @llvm.objectsize.i64.p0i8(i8* %ptr, i1 false, i1 true)
+  ; CHECK: %sz = call i64 @llvm.objectsize.i64.p0i8(i8* %ptr, i1 false, i1 true, i1 false)
+  ret void
+}
+
+declare i64 @llvm.objectsize.i64.p0i8(i8*, i1, i1)
+; CHECK: declare i64 @llvm.objectsize.i64.p0i8(i8*, i1, i1, i1)