diff --git a/test/Object/archive-replace-pos.test b/test/Object/archive-replace-pos.test
new file mode 100644
index 0000000..307f070
--- /dev/null
+++ b/test/Object/archive-replace-pos.test
@@ -0,0 +1,13 @@
+Test adding a member to a particular position
+
+RUN: touch %t.foo
+RUN: touch %t.bar
+RUN: rm -f %t.a
+RUN: llvm-ar rc %t.a %t.foo %t.bar
+RUN: touch %t.zed
+RUN: llvm-ar rca %t.foo %t.a %t.zed
+RUN: llvm-ar t %t.a | FileCheck %s
+
+CHECK: .foo
+CHECK-NEXT: .zed
+CHECK-NEXT: .bar
diff --git a/tools/llvm-ar/llvm-ar.cpp b/tools/llvm-ar/llvm-ar.cpp
index bd10f6f..4ade562 100644
--- a/tools/llvm-ar/llvm-ar.cpp
+++ b/tools/llvm-ar/llvm-ar.cpp
@@ -382,6 +382,7 @@
 public:
   NewArchiveIterator(object::Archive::child_iterator I, Twine Name);
   NewArchiveIterator(std::vector<std::string>::const_iterator I, Twine Name);
+  NewArchiveIterator();
   bool isNewMember() const;
   object::Archive::child_iterator getOld() const;
   const char *getNew() const;
@@ -389,6 +390,8 @@
 };
 }
 
+NewArchiveIterator::NewArchiveIterator() {}
+
 NewArchiveIterator::NewArchiveIterator(object::Archive::child_iterator I,
                                        Twine Name)
     : IsNewMember(false), OldI(I) {
@@ -415,14 +418,20 @@
 
 template <typename T>
 void addMember(std::vector<NewArchiveIterator> &Members,
-               std::string &StringTable, T I, StringRef Name) {
+               std::string &StringTable, T I, StringRef Name, int Pos = -1) {
   if (Name.size() < 16) {
     NewArchiveIterator NI(I, Twine(Name) + "/");
-    Members.push_back(NI);
+    if (Pos == -1)
+      Members.push_back(NI);
+    else
+      Members[Pos] = NI;
   } else {
     int MapIndex = StringTable.size();
     NewArchiveIterator NI(I, Twine("/") + Twine(MapIndex));
-    Members.push_back(NI);
+    if (Pos == -1)
+      Members.push_back(NI);
+    else
+      Members[Pos] = NI;
     StringTable += Name;
     StringTable += "/\n";
   }
@@ -462,6 +471,8 @@
         else
           InsertPos = Pos + 1;
       }
+      if (InsertPos == Pos)
+        Ret.resize(Ret.size() + Members.size());
       if (Operation != QuickAppend && !Members.empty()) {
         std::vector<std::string>::iterator MI =
             std::find_if(Members.begin(), Members.end(), HasName(Name));
@@ -488,23 +499,30 @@
   if (Operation == Delete)
     return Ret;
 
+  if (!RelPos.empty() && InsertPos == -1)
+    fail("Insertion point not found");
+
   if (Operation == Move) {
+    if (Members.size() != Moved.size())
+      fail("A member to be moved is not present in the archive");
+
     if (RelPos.empty()) {
       Ret.insert(Ret.end(), Moved.begin(), Moved.end());
       return Ret;
     }
-    if (InsertPos == -1)
-      fail("Insertion point not found");
     assert(unsigned(InsertPos) <= Ret.size());
-    Ret.insert(Ret.begin() + InsertPos, Moved.begin(), Moved.end());
+    std::copy(Moved.begin(), Moved.end(), Ret.begin() + InsertPos);
     return Ret;
   }
 
+  int Pos = InsertPos;
   for (std::vector<std::string>::iterator I = Members.begin(),
                                           E = Members.end();
        I != E; ++I) {
     StringRef Name = sys::path::filename(*I);
-    addMember(Ret, StringTable, I, Name);
+    addMember(Ret, StringTable, I, Name, Pos);
+    if (Pos != -1)
+      ++Pos;
   }
 
   return Ret;