diff --git a/VisualC/tests/testautomation/testautomation.vcxproj b/VisualC/tests/testautomation/testautomation.vcxproj
index 166b2da0d..1673aeeba 100644
--- a/VisualC/tests/testautomation/testautomation.vcxproj
+++ b/VisualC/tests/testautomation/testautomation.vcxproj
@@ -209,6 +209,7 @@
     <ClCompile Include="..\..\..\test\testautomation_hints.c" />
     <ClCompile Include="..\..\..\test\testautomation_keyboard.c" />
     <ClCompile Include="..\..\..\test\testautomation_main.c" />
+    <ClCompile Include="..\..\..\test\testautomation_math.c" />
     <ClCompile Include="..\..\..\test\testautomation_mouse.c" />
     <ClCompile Include="..\..\..\test\testautomation_pixels.c" />
     <ClCompile Include="..\..\..\test\testautomation_platform.c" />