diff --git a/yasnd.h b/yasnd.h
index 14bced8..4a19990 100644
--- a/yasnd.h
+++ b/yasnd.h
@@ -11,6 +11,7 @@
 
 // External functions
 extern void log_event(const char *message);
+extern void log_debug(const char *message,int verbosity);
 extern bool check_gammu_error(GSM_Error err);
 extern bool gammu_init();
 extern bool gammu_send_sms(const char* message);