diff --git a/build/HEVC_encoder_tests/HEVC_encoder_tests.vcxproj b/build/HEVC_encoder_tests/HEVC_encoder_tests.vcxproj
index 1841f3a6..4151afe2 100644
--- a/build/HEVC_encoder_tests/HEVC_encoder_tests.vcxproj
+++ b/build/HEVC_encoder_tests/HEVC_encoder_tests.vcxproj
@@ -82,7 +82,7 @@
   <ItemGroup>
     <ClCompile Include="..\..\..\seatest\src\seatest.c" />
     <ClCompile Include="..\..\tests\picture_list_tests.c" />
-    <ClCompile Include="..\..\tests\sad_tests.cpp" />
+    <ClCompile Include="..\..\tests\sad_tests.c" />
     <ClCompile Include="..\..\tests\tests_main.c" />
   </ItemGroup>
   <ItemGroup>
diff --git a/build/HEVC_encoder_tests/HEVC_encoder_tests.vcxproj.filters b/build/HEVC_encoder_tests/HEVC_encoder_tests.vcxproj.filters
index a06cae76..bf459c52 100644
--- a/build/HEVC_encoder_tests/HEVC_encoder_tests.vcxproj.filters
+++ b/build/HEVC_encoder_tests/HEVC_encoder_tests.vcxproj.filters
@@ -24,7 +24,7 @@
     <ClCompile Include="..\..\tests\picture_list_tests.c">
       <Filter>Source Files</Filter>
     </ClCompile>
-    <ClCompile Include="..\..\tests\sad_tests.cpp">
+    <ClCompile Include="..\..\tests\sad_tests.c">
       <Filter>Source Files</Filter>
     </ClCompile>
   </ItemGroup>
diff --git a/tests/sad_tests.cpp b/tests/sad_tests.c
similarity index 100%
rename from tests/sad_tests.cpp
rename to tests/sad_tests.c