diff --git a/brain/src/spiralcore/OSC_server.cpp b/brain/src/spiralcore/OSC_server.cpp
index 523e17f..360aba4 100644
--- a/brain/src/spiralcore/OSC_server.cpp
+++ b/brain/src/spiralcore/OSC_server.cpp
@@ -60,7 +60,7 @@ void OSC_server::error_handler(int num, const char *msg, const char *path) {
 }
 
 int OSC_server::default_handler(const char *path, const char *types, lo_arg **argv,
-                                int argc, void *data, void *user_data) {
+                                int argc, lo_message data, void *user_data) {
   OSC_server *server = (OSC_server*)user_data;
   if (!server) return -1;
 
diff --git a/brain/src/spiralcore/OSC_server.h b/brain/src/spiralcore/OSC_server.h
index afd5092..7584014 100644
--- a/brain/src/spiralcore/OSC_server.h
+++ b/brain/src/spiralcore/OSC_server.h
@@ -32,7 +32,7 @@ public:
   bool ok() { return m_server!=NULL; }
   
 private:
-  static int default_handler(const char *path, const char *types, lo_arg **argv, int argc, void *data, void *user_data);
+  static int default_handler(const char *path, const char *types, lo_arg **argv, int argc, lo_message data, void *user_data);
   static void error_handler(int num, const char *m, const char *path);
 
   lo_server_thread m_server;