diff --git a/src/util.vcxproj.filters b/src/util.vcxproj.filters
index 7ef937c10..1530a0454 100644
--- a/src/util.vcxproj.filters
+++ b/src/util.vcxproj.filters
@@ -105,7 +105,7 @@
       <Filter>Header Files</Filter>
     </ClInclude>
     <ClInclude Include="util\os.h">
-      <Filter>Source Files</Filter>
+      <Filter>Header Files</Filter>
     </ClInclude>
   </ItemGroup>
   <ItemGroup>