diff --git a/src/SMAPI.Tests.ModApiConsumer/Interfaces/ISimpleApi.cs b/src/SMAPI.Tests.ModApiConsumer/Interfaces/ISimpleApi.cs
index 7f94e137..c99605e4 100644
--- a/src/SMAPI.Tests.ModApiConsumer/Interfaces/ISimpleApi.cs
+++ b/src/SMAPI.Tests.ModApiConsumer/Interfaces/ISimpleApi.cs
@@ -1,6 +1,7 @@
 using System;
 using System.Collections.Generic;
 using System.Reflection;
+using StardewModdingAPI.Utilities;
 
 namespace SMAPI.Tests.ModApiConsumer.Interfaces
 {
@@ -69,6 +70,9 @@ namespace SMAPI.Tests.ModApiConsumer.Interfaces
         /// <summary>A simple method which returns a lambda.</summary>
         Func<string, string> GetLambda(Func<string, string> value);
 
+        /// <summary>A simple method which returns out parameters.</summary>
+        bool TryGetOutParameter(int inputNumber, out int outNumber, out string outString, out PerScreen<int> outReference, out IDictionary<int, PerScreen<int>> outComplexType);
+
 
         /****
         ** Inherited members
diff --git a/src/SMAPI.Tests.ModApiProvider/Framework/SimpleApi.cs b/src/SMAPI.Tests.ModApiProvider/Framework/SimpleApi.cs
index e7e1ccef..c8781da5 100644
--- a/src/SMAPI.Tests.ModApiProvider/Framework/SimpleApi.cs
+++ b/src/SMAPI.Tests.ModApiProvider/Framework/SimpleApi.cs
@@ -3,6 +3,7 @@
 using System;
 using System.Collections.Generic;
 using System.Reflection;
+using StardewModdingAPI.Utilities;
 
 namespace SMAPI.Tests.ModApiProvider.Framework
 {
@@ -96,6 +97,20 @@ namespace SMAPI.Tests.ModApiProvider.Framework
             return value;
         }
 
+        /// <summary>A simple method which returns out parameters.</summary>
+        public bool TryGetOutParameter(int inputNumber, out int outNumber, out string outString, out PerScreen<int> outReference, out IDictionary<int, PerScreen<int>> outComplexType)
+        {
+            outNumber = inputNumber;
+            outString = inputNumber.ToString();
+            outReference = new PerScreen<int>(() => inputNumber);
+            outComplexType = new Dictionary<int, PerScreen<int>>
+            {
+                [inputNumber] = new PerScreen<int>(() => inputNumber)
+            };
+
+            return true;
+        }
+
 
         /*********
         ** Helper methods
diff --git a/src/SMAPI.Tests.ModApiProvider/SMAPI.Tests.ModApiProvider.csproj b/src/SMAPI.Tests.ModApiProvider/SMAPI.Tests.ModApiProvider.csproj
index 70d5a0ce..7fef4ebd 100644
--- a/src/SMAPI.Tests.ModApiProvider/SMAPI.Tests.ModApiProvider.csproj
+++ b/src/SMAPI.Tests.ModApiProvider/SMAPI.Tests.ModApiProvider.csproj
@@ -4,4 +4,8 @@
   </PropertyGroup>
 
   <Import Project="..\..\build\common.targets" />
+
+  <ItemGroup>
+    <ProjectReference Include="..\SMAPI\SMAPI.csproj" />
+  </ItemGroup>
 </Project>
diff --git a/src/SMAPI.Tests/Core/InterfaceProxyTests.cs b/src/SMAPI.Tests/Core/InterfaceProxyTests.cs
index 0b4919ed..8d27f6af 100644
--- a/src/SMAPI.Tests/Core/InterfaceProxyTests.cs
+++ b/src/SMAPI.Tests/Core/InterfaceProxyTests.cs
@@ -1,6 +1,7 @@
 using System;
 using System.Collections.Generic;
 using System.Diagnostics.CodeAnalysis;
+using System.Linq;
 using System.Reflection;
 using FluentAssertions;
 using NUnit.Framework;
@@ -8,6 +9,7 @@ using SMAPI.Tests.ModApiConsumer;
 using SMAPI.Tests.ModApiConsumer.Interfaces;
 using SMAPI.Tests.ModApiProvider;
 using StardewModdingAPI.Framework.Reflection;
+using StardewModdingAPI.Utilities;
 
 namespace SMAPI.Tests.Core
 {
@@ -308,6 +310,43 @@ namespace SMAPI.Tests.Core
             actualValue.Should().BeSameAs(expectedValue);
         }
 
+        /// <summary>Assert that a method with out parameters can be proxied correctly.</summary>
+        [Test]
+        [SuppressMessage("ReSharper", "ConvertToLocalFunction")]
+        public void CanProxy_Method_OutParameters()
+        {
+            // arrange
+            object implementation = new ProviderMod().GetModApi();
+            const int expectedNumber = 42;
+
+            // act
+            ISimpleApi proxy = this.GetProxy(implementation);
+            bool result = proxy.TryGetOutParameter(
+                inputNumber: expectedNumber,
+
+                out int outNumber,
+                out string outString,
+                out PerScreen<int> outReference,
+                out IDictionary<int, PerScreen<int>> outComplexType
+            );
+
+            // assert
+            result.Should().BeTrue();
+
+            outNumber.Should().Be(expectedNumber);
+
+            outString.Should().Be(expectedNumber.ToString());
+
+            outReference.Should().NotBeNull();
+            outReference.Value.Should().Be(expectedNumber);
+
+            outComplexType.Should().NotBeNull();
+            outComplexType.Count.Should().Be(1);
+            outComplexType.Keys.First().Should().Be(expectedNumber);
+            outComplexType.Values.First().Should().NotBeNull();
+            outComplexType.Values.First().Value.Should().Be(expectedNumber);
+        }
+
 
         /*********
         ** Private methods