diff --git a/src/opus.vcxproj b/src/opus.vcxproj
index f55df7ccf3e43670f34da2a915ac80ba1deb55f1..85d6e37718c7c465db24e27eabde6a90b51961ee 100644
--- a/src/opus.vcxproj
+++ b/src/opus.vcxproj
@@ -153,6 +153,7 @@
     <ClCompile Include="opus_decoder.c" />
     <ClCompile Include="opus_demo.c" />
     <ClCompile Include="opus_encoder.c" />
+    <ClCompile Include="opus_multistream.c" />
     <ClCompile Include="repacketizer.c" />
   </ItemGroup>
   <ItemGroup>
diff --git a/src/opus.vcxproj.filters b/src/opus.vcxproj.filters
index 11dac619eb2122a82da12b617fe39c9f15caf925..0f59dbe3fb14e294bbeb3dd898b916534dab1edf 100644
--- a/src/opus.vcxproj.filters
+++ b/src/opus.vcxproj.filters
@@ -30,6 +30,9 @@
     <ClCompile Include="opus_demo.c">
       <Filter>Source Files</Filter>
     </ClCompile>
+    <ClCompile Include="opus_multistream.c">
+      <Filter>Source Files</Filter>
+    </ClCompile>
   </ItemGroup>
   <ItemGroup>
     <ClInclude Include="..\win32\config.h">