diff --git a/contrib/ports/win32/msvc/lwip_unittests.vcxproj.filters b/contrib/ports/win32/msvc/lwip_unittests.vcxproj.filters
index 76639188..bbac4e7b 100644
--- a/contrib/ports/win32/msvc/lwip_unittests.vcxproj.filters
+++ b/contrib/ports/win32/msvc/lwip_unittests.vcxproj.filters
@@ -97,6 +97,9 @@
     <ClCompile Include="..\..\..\..\test\unit\ppp\test_pppos.c">
       <Filter>ppp</Filter>
     </ClCompile>
+    <ClCompile Include="..\..\..\..\test\unit\tcp\test_tcp_state.c">
+      <Filter>tcp</Filter>
+    </ClCompile>
   </ItemGroup>
   <ItemGroup>
     <ClInclude Include="..\..\..\..\test\unit\core\test_mem.h">
@@ -158,5 +161,8 @@
     <ClInclude Include="..\..\..\..\test\unit\ppp\test_pppos.h">
       <Filter>ppp</Filter>
     </ClInclude>
+    <ClInclude Include="..\..\..\..\test\unit\tcp\test_tcp_state.h">
+      <Filter>tcp</Filter>
+    </ClInclude>
   </ItemGroup>
 </Project>
\ No newline at end of file
diff --git a/test/unit/tcp/test_tcp_state.c b/test/unit/tcp/test_tcp_state.c
index 6d25eaa5..f7a737c9 100644
--- a/test/unit/tcp/test_tcp_state.c
+++ b/test/unit/tcp/test_tcp_state.c
@@ -157,6 +157,7 @@ START_TEST(test_tcp_new_max_num_remove_TIME_WAIT)
   struct tcp_pcb* pcb;
   struct tcp_pcb* pcb_list[MEMP_NUM_TCP_PCB + 1];
   int i;
+  LWIP_UNUSED_ARG(_i);
 
   /* create a pcb in TIME_WAIT state */
   pcb = tcp_new();
@@ -196,6 +197,7 @@ START_TEST(test_tcp_connect_active_open)
   err_t err;
   u16_t test_port = 1234;
   u32_t seqno = 0;
+  LWIP_UNUSED_ARG(_i);
 
   /* create and initialize the pcb */
   tcp_ticks = SEQNO1 - ISS;