diff --git a/server/Sample/sf_ainput.c b/server/Sample/sf_ainput.c
index 1c19e0704..5d329565a 100644
--- a/server/Sample/sf_ainput.c
+++ b/server/Sample/sf_ainput.c
@@ -38,8 +38,8 @@
  *
  * @return 0 on success, otherwise a Win32 error code
  */
-static UINT sf_peer_ainput_mouse_event(ainput_server_context* context, UINT64 timestamp,
-                                       UINT64 flags, INT32 x, INT32 y)
+static UINT sf_peer_ainput_mouse_event(WINPR_ATTR_UNUSED ainput_server_context* context,
+                                       UINT64 timestamp, UINT64 flags, INT32 x, INT32 y)
 {
 	/* TODO: Implement */
 	WINPR_ASSERT(context);
diff --git a/server/Sample/sf_audin.c b/server/Sample/sf_audin.c
index 5783fe60d..02d3f4bc8 100644
--- a/server/Sample/sf_audin.c
+++ b/server/Sample/sf_audin.c
@@ -34,7 +34,8 @@
 
 #if defined(CHANNEL_AUDIN_SERVER)
 
-static UINT sf_peer_audin_data(audin_server_context* audin, const SNDIN_DATA* data)
+static UINT sf_peer_audin_data(WINPR_ATTR_UNUSED audin_server_context* audin,
+                               const SNDIN_DATA* data)
 {
 	/* TODO: Implement */
 	WINPR_ASSERT(audin);