diff --git a/strings/base_implements.h b/strings/base_implements.h
index b620c6a6a..89b6c5790 100644
--- a/strings/base_implements.h
+++ b/strings/base_implements.h
@@ -1033,8 +1033,8 @@ namespace winrt::impl
                     {
                         return error_bad_alloc;
                     }
-                    *array = std::copy(local_iids.second, local_iids.second + local_count, *array);
-                    std::copy(inner_iids.cbegin(), inner_iids.cend(), *array);
+                    auto next = std::copy(local_iids.second, local_iids.second + local_count, *array);
+                    std::copy(inner_iids.cbegin(), inner_iids.cend(), next);
                 }
                 else
                 {
diff --git a/test/old_tests/UnitTests/Composable.cpp b/test/old_tests/UnitTests/Composable.cpp
index 3cbc283d6..080e3769c 100644
--- a/test/old_tests/UnitTests/Composable.cpp
+++ b/test/old_tests/UnitTests/Composable.cpp
@@ -167,4 +167,20 @@ TEST_CASE("Composable conversions")
 {
     TestCalls(*make_self<Foo>());
     TestCalls(*make_self<Bar>());
-}
\ No newline at end of file
+}
+
+TEST_CASE("Composable get_interfaces")
+{
+    struct Foo : Composable::BaseT<Foo, IStringable> {
+        hstring ToString() const { return L"Foo"; }
+    };
+
+    auto obj = make<Foo>();
+    auto iids = winrt::get_interfaces(obj);
+    // BaseOverrides IID gets repeated twice. There are only 4 unique interfaces.
+    REQUIRE(iids.size() == 5);
+    REQUIRE(std::find(iids.begin(), iids.end(), guid_of<IBase>()) != iids.end());
+    REQUIRE(std::find(iids.begin(), iids.end(), guid_of<IBaseProtected>()) != iids.end());
+    REQUIRE(std::find(iids.begin(), iids.end(), guid_of<IBaseOverrides>()) != iids.end());
+    REQUIRE(std::find(iids.begin(), iids.end(), guid_of<IStringable>()) != iids.end());
+}