diff --git a/marketmaker.vcxproj b/marketmaker.vcxproj
index 26e11409a..fbe023dc8 100644
--- a/marketmaker.vcxproj
+++ b/marketmaker.vcxproj
@@ -248,6 +248,7 @@
     <ClCompile Include="crypto777\scrypt.c" />
     <ClCompile Include="crypto777\tweetnacl.c" />
     <ClCompile Include="iguana\exchanges\mm.c" />
+    <ClCompile Include="iguana\groestl.c" />
     <ClCompile Include="iguana\mini-gmp.c" />
     <ClCompile Include="iguana\secp256k1\src\secp256k1.c" />
     <ClCompile Include="iguana\segwit_addr.c" />
diff --git a/marketmaker.vcxproj.filters b/marketmaker.vcxproj.filters
index 59cf37d99..36d2bdfe0 100644
--- a/marketmaker.vcxproj.filters
+++ b/marketmaker.vcxproj.filters
@@ -293,6 +293,9 @@
     <ClCompile Include="iguana\segwit_addr.c">
       <Filter>Source Files</Filter>
     </ClCompile>
+    <ClCompile Include="iguana\groestl.c">
+      <Filter>Source Files</Filter>
+    </ClCompile>
   </ItemGroup>
   <ItemGroup>
     <Text Include="ReadMe.txt" />