diff --git a/include/openbsc/debug.h b/include/openbsc/debug.h
index 995a0f8..63f9e67 100644
--- a/include/openbsc/debug.h
+++ b/include/openbsc/debug.h
@@ -33,6 +33,7 @@
 void debugp(unsigned int subsys, char *file, int line, int cont, const char *format, ...);
 void debug_parse_category_mask(const char* mask);
 void debug_use_color(int use_color);
+void debug_timestamp(int enable);
 extern unsigned int debug_mask;
 
 #endif /* _DEBUG_H */