diff --git a/libs/freetdm/src/ftmod/ftmod_sangoma_isdn/ftmod_sangoma_isdn.2008.vcproj b/libs/freetdm/src/ftmod/ftmod_sangoma_isdn/ftmod_sangoma_isdn.2008.vcproj
index 01395cb1db..f6263907e1 100644
--- a/libs/freetdm/src/ftmod/ftmod_sangoma_isdn/ftmod_sangoma_isdn.2008.vcproj
+++ b/libs/freetdm/src/ftmod/ftmod_sangoma_isdn/ftmod_sangoma_isdn.2008.vcproj
@@ -238,6 +238,10 @@
 				RelativePath=".\ftmod_sangoma_isdn_trace.c"
 				>
 			</File>
+			<File
+				RelativePath=".\ftmod_sangoma_isdn_transfer.c"
+				>
+			</File>
 		</Filter>
 	</Files>
 	<Globals>
diff --git a/libs/freetdm/src/ftmod/ftmod_sangoma_isdn/ftmod_sangoma_isdn.2010.vcxproj b/libs/freetdm/src/ftmod/ftmod_sangoma_isdn/ftmod_sangoma_isdn.2010.vcxproj
index d7b75d8df4..7ec8fd3346 100644
--- a/libs/freetdm/src/ftmod/ftmod_sangoma_isdn/ftmod_sangoma_isdn.2010.vcxproj
+++ b/libs/freetdm/src/ftmod/ftmod_sangoma_isdn/ftmod_sangoma_isdn.2010.vcxproj
@@ -189,6 +189,7 @@
     <ClCompile Include="ftmod_sangoma_isdn_stack_rcv.c" />
     <ClCompile Include="ftmod_sangoma_isdn_support.c" />
     <ClCompile Include="ftmod_sangoma_isdn_trace.c" />
+    <ClCompile Include="ftmod_sangoma_isdn_transfer.c" />
   </ItemGroup>
   <ItemGroup>
     <ProjectReference Include="..\..\..\msvc\freetdm.2010.vcxproj">
@@ -199,4 +200,4 @@
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
   <ImportGroup Label="ExtensionTargets">
   </ImportGroup>
-</Project>
\ No newline at end of file
+</Project>