diff --git a/Makefile b/Makefile
index 991ce87c812..d7f3db993be 100644
--- a/Makefile
+++ b/Makefile
@@ -117,6 +117,16 @@ sdk:
 	sh ocaml/sdk-gen/windows-line-endings.sh $(XAPISDK)/csharp
 	sh ocaml/sdk-gen/windows-line-endings.sh $(XAPISDK)/powershell
 
+.PHONY: sdk-build-c sdk sdksanity
+
+sdk-build-c: sdk
+	cd _build/install/default/xapi/sdk/c && make -j $(JOBS)
+
+# workaround for no .resx generation, just for compilation testing
+sdksanity: sdk
+	sed -i 's/FriendlyErrorNames.ResourceManager/null/g' ./_build/install/default/xapi/sdk/csharp/src/Failure.cs
+	cd _build/install/default/xapi/sdk/csharp/src && dotnet add package Newtonsoft.Json && dotnet build -f netstandard2.0
+
 .PHONY: sdk-build-java
 
 sdk-build-java: sdk
diff --git a/ocaml/sdk-gen/c/autogen/src/xen_common.c b/ocaml/sdk-gen/c/autogen/src/xen_common.c
index 9081f9bd725..9178d3fd43f 100644
--- a/ocaml/sdk-gen/c/autogen/src/xen_common.c
+++ b/ocaml/sdk-gen/c/autogen/src/xen_common.c
@@ -292,10 +292,7 @@ set_api_version(xen_session *session)
 void
 xen_session_logout(xen_session *session)
 {
-    abstract_value params[] =
-        {
-        };
-    xen_call_(session, "session.logout", params, 0, NULL, NULL);
+    xen_call_(session, "session.logout", NULL, 0, NULL, NULL);
 
     if (session->error_description != NULL)
     {
@@ -314,10 +311,7 @@ xen_session_logout(xen_session *session)
 void
 xen_session_local_logout(xen_session *session)
 {
-    abstract_value params[] =
-        {
-        };
-    xen_call_(session, "session.local_logout", params, 0, NULL, NULL);
+    xen_call_(session, "session.local_logout", NULL, 0, NULL, NULL);
 
     if (session->error_description != NULL)
     {
@@ -336,14 +330,11 @@ xen_session_local_logout(xen_session *session)
 bool
  xen_session_get_all_subject_identifiers(xen_session *session, struct xen_string_set **result)
 {
-    abstract_value params[] =
-        {
-        };
 
     abstract_type result_type = abstract_type_string_set;
 
     *result = NULL;
-    xen_call_(session, "session.get_all_subject_identifiers", params, 0, &result_type, result);
+    xen_call_(session, "session.get_all_subject_identifiers", NULL, 0, &result_type, result);
     return session->ok;
 }
 
@@ -351,14 +342,10 @@ bool
 bool
 xen_session_get_all_subject_identifiers_async(xen_session *session, xen_task *result)
 {
-    abstract_value params[] =
-        {
-        };
-
     abstract_type result_type = abstract_type_string;
 
     *result = NULL;
-    xen_call_(session, "Async.session.get_all_subject_identifiers", params, 0, &result_type, result);
+    xen_call_(session, "Async.session.get_all_subject_identifiers", NULL, 0, &result_type, result);
     return session->ok;
 }
 
diff --git a/ocaml/sdk-gen/c/gen_c_binding.ml b/ocaml/sdk-gen/c/gen_c_binding.ml
index e9035a88c7f..2302fc6cf99 100644
--- a/ocaml/sdk-gen/c/gen_c_binding.ml
+++ b/ocaml/sdk-gen/c/gen_c_binding.ml
@@ -374,7 +374,9 @@ and impl_message needed classname message =
         sprintf
           "    xen_call_(session, \"%s.%s\", %s, %d, NULL, NULL);\n\
           \    return session->ok;\n"
-          classname message.msg_name param_call param_count
+          classname message.msg_name
+          (if param_count = 0 then "NULL" else param_call)
+          param_count
   in
 
   let messageAsyncImpl = impl_message_async needed classname message in