diff --git a/IPhreeqc.2012.vcxproj b/IPhreeqc.2012.vcxproj
index 1be1766b..5a7ccfa0 100644
--- a/IPhreeqc.2012.vcxproj
+++ b/IPhreeqc.2012.vcxproj
@@ -500,7 +500,6 @@ copy "$(OutDir)vc100.pdb" "dllx64\vc100.pdb"
     <ClCompile Include="src\phreeqcpp\cvdense.cpp" />
     <ClCompile Include="src\phreeqcpp\cvode.cpp" />
     <ClCompile Include="src\phreeqcpp\dense.cpp" />
-    <ClCompile Include="src\phreeqcpp\dw.cpp" />
     <ClCompile Include="src\phreeqcpp\gases.cpp" />
     <ClCompile Include="src\phreeqcpp\input.cpp" />
     <ClCompile Include="src\phreeqcpp\integrate.cpp" />
diff --git a/IPhreeqc.2012.vcxproj.filters b/IPhreeqc.2012.vcxproj.filters
index d3d23020..ba0329a3 100644
--- a/IPhreeqc.2012.vcxproj.filters
+++ b/IPhreeqc.2012.vcxproj.filters
@@ -149,9 +149,6 @@
     <ClCompile Include="src\phreeqcpp\dense.cpp">
       <Filter>Source Files\phreeqcpp\phreeqc</Filter>
     </ClCompile>
-    <ClCompile Include="src\phreeqcpp\dw.cpp">
-      <Filter>Source Files\phreeqcpp\phreeqc</Filter>
-    </ClCompile>
     <ClCompile Include="src\phreeqcpp\gases.cpp">
       <Filter>Source Files\phreeqcpp\phreeqc</Filter>
     </ClCompile>