diff --git a/config-msvc.h b/config-msvc.h
index 0bcf7195..9c8d4237 100644
--- a/config-msvc.h
+++ b/config-msvc.h
@@ -12,6 +12,8 @@
 #define ENABLE_FRAGMENT 1
 #define ENABLE_HTTP_PROXY 1
 #define ENABLE_LZO 1
+#define ENABLE_LZ4 1
+#define NEED_COMPAT_LZ4 1
 #define ENABLE_MANAGEMENT 1
 #define ENABLE_MULTIHOME 1
 #define ENABLE_PKCS11 1
diff --git a/src/compat/compat.vcxproj b/src/compat/compat.vcxproj
index 7fca62fc..d2695e6b 100644
--- a/src/compat/compat.vcxproj
+++ b/src/compat/compat.vcxproj
@@ -79,6 +79,7 @@
     <ClCompile Include="compat-inet_ntop.c" />
     <ClCompile Include="compat-inet_pton.c" />
     <ClCompile Include="compat-daemon.c" />
+    <ClCompile Include="compat-lz4.c" />
   </ItemGroup>
   <ItemGroup>
     <ClInclude Include="compat.h" />
diff --git a/src/compat/compat.vcxproj.filters b/src/compat/compat.vcxproj.filters
index 00bb0ffa..0f78e86e 100644
--- a/src/compat/compat.vcxproj.filters
+++ b/src/compat/compat.vcxproj.filters
@@ -33,6 +33,9 @@
     <ClCompile Include="compat-daemon.c">
       <Filter>Source Files</Filter>
     </ClCompile>
+    <ClCompile Include="compat-lz4.c">
+      <Filter>Source Files</Filter>
+    </ClCompile>
   </ItemGroup>
   <ItemGroup>
     <ClInclude Include="compat.h">
diff --git a/src/openvpn/comp-lz4.h b/src/openvpn/comp-lz4.h
index 9d3c6644..7774ca5a 100644
--- a/src/openvpn/comp-lz4.h
+++ b/src/openvpn/comp-lz4.h
@@ -35,6 +35,7 @@ extern const struct compress_alg lz4v2_alg;
 
 struct lz4_workspace
 {
+  int dummy;
 };
 
 #endif /* ENABLE_LZ4 */
diff --git a/src/openvpn/openvpn.vcxproj b/src/openvpn/openvpn.vcxproj
index 821c46c2..8dfbea52 100644
--- a/src/openvpn/openvpn.vcxproj
+++ b/src/openvpn/openvpn.vcxproj
@@ -102,6 +102,7 @@
     <ClCompile Include="base64.c" />
     <ClCompile Include="buffer.c" />
     <ClCompile Include="clinat.c" />
+    <ClCompile Include="comp-lz4.c" />
     <ClCompile Include="comp.c" />
     <ClCompile Include="compstub.c" />
     <ClCompile Include="console.c" />
@@ -172,9 +173,10 @@
     <ClInclude Include="buffer.h" />
     <ClInclude Include="circ_list.h" />
     <ClInclude Include="clinat.h" />
+    <ClInclude Include="common.h" />
+    <ClInclude Include="comp-lz4.h" />
     <ClInclude Include="comp.h" />
     <ClInclude Include="compstub.h" />
-    <ClInclude Include="common.h" />
     <ClInclude Include="console.h" />
     <ClInclude Include="crypto.h" />
     <ClInclude Include="crypto_backend.h" />
diff --git a/src/openvpn/openvpn.vcxproj.filters b/src/openvpn/openvpn.vcxproj.filters
index 40336ba8..8b6a2696 100644
--- a/src/openvpn/openvpn.vcxproj.filters
+++ b/src/openvpn/openvpn.vcxproj.filters
@@ -207,6 +207,15 @@
     <ClCompile Include="win32.c">
       <Filter>Source Files</Filter>
     </ClCompile>
+    <ClCompile Include="comp.c">
+      <Filter>Source Files</Filter>
+    </ClCompile>
+    <ClCompile Include="compstub.c">
+      <Filter>Source Files</Filter>
+    </ClCompile>
+    <ClCompile Include="comp-lz4.c">
+      <Filter>Source Files</Filter>
+    </ClCompile>
   </ItemGroup>
   <ItemGroup>
     <ClInclude Include="base64.h">
@@ -227,6 +236,12 @@
     <ClInclude Include="common.h">
       <Filter>Header Files</Filter>
     </ClInclude>
+    <ClInclude Include="comp.h">
+      <Filter>Header Files</Filter>
+    </ClInclude>
+    <ClInclude Include="comp-lz4.h">
+      <Filter>Header Files</Filter>
+    </ClInclude>
     <ClInclude Include="console.h">
       <Filter>Header Files</Filter>
     </ClInclude>
@@ -455,4 +470,4 @@
       <Filter>Resource Files</Filter>
     </ResourceCompile>
   </ItemGroup>
-</Project>
\ No newline at end of file
+</Project>