diff --git a/src/Spring/Spring.Aop/Spring.Aop.2003.csproj b/src/Spring/Spring.Aop/Spring.Aop.2003.csproj
index 53846051..ffecc1f5 100644
--- a/src/Spring/Spring.Aop/Spring.Aop.2003.csproj
+++ b/src/Spring/Spring.Aop/Spring.Aop.2003.csproj
@@ -241,6 +241,10 @@
                     SubType = "Code"
                     BuildAction = "Compile"
                 />
+                <File RelPath="Aop\Framework\DynamicProxy\AbstractAopProxyFactory.cs"
+                    SubType = "Code"
+                    BuildAction = "Compile"
+                />
                 <File
                     RelPath = "Aop\Framework\DynamicTargetSourceWrapper.cs"
                     SubType = "Code"
diff --git a/src/Spring/Spring.Aop/Spring.Aop.2005.csproj b/src/Spring/Spring.Aop/Spring.Aop.2005.csproj
index 63fb8552..a197ff7e 100644
--- a/src/Spring/Spring.Aop/Spring.Aop.2005.csproj
+++ b/src/Spring/Spring.Aop/Spring.Aop.2005.csproj
@@ -130,6 +130,7 @@
     <Compile Include="Aop\Framework\AutoProxy\PointcutFilteringAutoProxyCreator.cs" />
     <Compile Include="Aop\Framework\AutoProxy\TypeNameAutoProxyCreator.cs" />
     <Compile Include="Aop\Framework\DynamicMethodInvocation.cs" />
+    <Compile Include="Aop\Framework\DynamicProxy\AbstractAopProxyFactory.cs" />
     <Compile Include="Aop\Framework\DynamicProxy\CachedAopProxyFactory.cs" />
     <Compile Include="Aop\Framework\DynamicProxy\DefaultAopProxyFactory.cs" />
     <Compile Include="Aop\Framework\DynamicProxy\InheritanceAopProxyTypeBuilder.cs" />