diff --git a/build-windows/pEpEngine.vcxproj b/build-windows/pEpEngine.vcxproj
index 5d9359c6..9427c42b 100644
--- a/build-windows/pEpEngine.vcxproj
+++ b/build-windows/pEpEngine.vcxproj
@@ -68,8 +68,7 @@
       <AdditionalDependencies>Rpcrt4.lib;%(AdditionalDependencies)</AdditionalDependencies>
     </Link>
     <PreBuildEvent>
-      <Command>
-      </Command>
+      <Command>"$(ProjDir)generate_code.cmd" "$(ProjDir).."</Command>
     </PreBuildEvent>
   </ItemDefinitionGroup>
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
@@ -95,8 +94,7 @@
       <AdditionalDependencies>Rpcrt4.lib;%(AdditionalDependencies)</AdditionalDependencies>
     </Link>
     <PreBuildEvent>
-      <Command>
-      </Command>
+      <Command>"$(ProjDir)generate_code.cmd" "$(ProjDir).."</Command>
     </PreBuildEvent>
   </ItemDefinitionGroup>
   <ItemGroup>
diff --git a/sync/gen_codec.ysl2 b/sync/gen_codec.ysl2
index 695740af..75bb9b7a 100644
--- a/sync/gen_codec.ysl2
+++ b/sync/gen_codec.ysl2
@@ -103,12 +103,14 @@ tstylesheet {
         // This file is under GNU General Public License 3.0
         // see LICENSE.txt
 
+        #include "platform.h"
+
         #include "«yml:lcase(@name)»_codec.h"
         #include "../asn.1/«@name».h"
         #include "pEp_internal.h"
         #include "growing_buf.h"
 
-        PEP_STATUS decode_«@name»_message(
+        DYNAMIC_API PEP_STATUS decode_«@name»_message(
                 const char *data,
                 size_t size,
                 «@name»_t **msg