diff --git a/src/StreamJsonRpc/JsonRpc.cs b/src/StreamJsonRpc/JsonRpc.cs
index 230c3c0a0..add25ef0b 100644
--- a/src/StreamJsonRpc/JsonRpc.cs
+++ b/src/StreamJsonRpc/JsonRpc.cs
@@ -7,6 +7,7 @@
 using System.Diagnostics.CodeAnalysis;
 using System.Globalization;
 using System.Reflection;
+using System.Runtime.CompilerServices;
 using Microsoft.VisualStudio.Threading;
 using Newtonsoft.Json;
 using StreamJsonRpc.Protocol;
@@ -2775,6 +2776,13 @@ private T CreateProxy<T>(ReadOnlySpan<Type> additionalContractInterfaces, ReadOn
     [RequiresDynamicCode(RuntimeReasons.RefEmit), RequiresUnreferencedCode(RuntimeReasons.RefEmit)]
     private IJsonRpcClientProxyInternal CreateProxy(Type contractInterface, ReadOnlySpan<Type> additionalContractInterfaces, ReadOnlySpan<(Type Type, int Code)> implementedOptionalInterfaces, JsonRpcProxyOptions? options, long? marshaledObjectHandle)
     {
+#if !NETSTANDARD2_0
+        if (!RuntimeFeature.IsDynamicCodeSupported)
+        {
+            throw new NotSupportedException("CreateProxy is not supported if dynamic code is not supported.");
+        }
+#endif
+
         TypeInfo proxyType = ProxyGeneration.Get(contractInterface, additionalContractInterfaces, implementedOptionalInterfaces);
         return (IJsonRpcClientProxyInternal)Activator.CreateInstance(
             proxyType.AsType(),