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-rw-r--r--csharp/src/Google.Protobuf/Reflection/MessageDescriptor.cs4
1 files changed, 4 insertions, 0 deletions
diff --git a/csharp/src/Google.Protobuf/Reflection/MessageDescriptor.cs b/csharp/src/Google.Protobuf/Reflection/MessageDescriptor.cs
index f5a835e5..7a1cb9d5 100644
--- a/csharp/src/Google.Protobuf/Reflection/MessageDescriptor.cs
+++ b/csharp/src/Google.Protobuf/Reflection/MessageDescriptor.cs
@@ -34,6 +34,10 @@ using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Linq;
+#if DOTNET35
+// Needed for ReadOnlyDictionary, which does not exist in .NET 3.5
+using Google.Protobuf.Collections;
+#endif
namespace Google.Protobuf.Reflection
{