1 files changed, 2 insertions, 2 deletions
diff --git a/csharp/src/ProtocolBuffers/Descriptors/DescriptorUtil.cs b/csharp/src/ProtocolBuffers/Descriptors/DescriptorUtil.cs
index 9fc84c3e..db3e21f5 100644
--- a/csharp/src/ProtocolBuffers/Descriptors/DescriptorUtil.cs
+++ b/csharp/src/ProtocolBuffers/Descriptors/DescriptorUtil.cs
@@ -30,7 +30,7 @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 using System.Collections.Generic;
-using Google.Protobuf.Collections;
+using System.Collections.ObjectModel;
 
 namespace Google.Protobuf.Descriptors
 {
@@ -58,7 +58,7 @@ namespace Google.Protobuf.Descriptors
             {
                 array[i] = converter(input[i], i);
             }
-            return Lists<TOutput>.AsReadOnly(array);
+            return new ReadOnlyCollection<TOutput>(array);
         }
     }
 }
 \ No newline at end of file