diff --git a/Dynamitey/Internal/Optimization/InvokeHelper-Regular.cs b/Dynamitey/Internal/Optimization/InvokeHelper-Regular.cs
index 59336bf..d9ebed6 100644
--- a/Dynamitey/Internal/Optimization/InvokeHelper-Regular.cs
+++ b/Dynamitey/Internal/Optimization/InvokeHelper-Regular.cs
@@ -88,11 +88,20 @@ internal static Type EmitCallSiteFuncType(IEnumerable<Type> argTypes, Type retur
         {
             try
             {
-                return BuildProxy.EmitCallSiteFuncType(argTypes, returnType);
+                //Impromptu Interface version 8.04
+                return BuildProxy.DefaultProxyMaker.EmitCallSiteFuncType(argTypes, returnType);
             }
             catch (LateType.MissingTypeException ex)
-            {
-                throw new TypeLoadException("Cannot Emit long delegates without ImpromptuInterface installed", ex);
+            {  
+                try
+                {
+                    //Impromptu Interface 7.X
+                    return BuildProxy.EmitCallSiteFuncType(argTypes, returnType);
+                }
+                catch (LateType.MissingTypeException)
+                {
+                    throw new TypeLoadException("Cannot Emit long delegates without ImpromptuInterface installed", ex);
+                }
             }
     
         }
diff --git a/Tests/Tests.csproj b/Tests/Tests.csproj
index 75cb178..437777e 100644
--- a/Tests/Tests.csproj
+++ b/Tests/Tests.csproj
@@ -5,7 +5,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="ImpromptuInterface" Version="8.0.3" />
+    <PackageReference Include="ImpromptuInterface" Version="8.0.4" />
     <PackageReference Include="Microsoft.CSharp" Version="4.*" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="15.3.0" />
     <PackageReference Include="NUnit" Version="3.13.3" />
@@ -17,7 +17,7 @@
   </ItemGroup>
 
  
-  <ItemGroup >
+  <ItemGroup>
     <PackageReference Include="NUnit3TestAdapter" Version="4.5.0" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.7.2" />
   </ItemGroup>
diff --git a/Version.props b/Version.props
index 6d87896..daff1c8 100644
--- a/Version.props
+++ b/Version.props
@@ -1,5 +1,5 @@
 <Project>
     <PropertyGroup>
-        <VersionPrefix>3.0.2</VersionPrefix>
+        <VersionPrefix>3.0.3</VersionPrefix>
     </PropertyGroup>
 </Project>
\ No newline at end of file