diff --git a/src/debug.h b/src/debug.h
--- a/src/debug.h
+++ b/src/debug.h
@@ -28,15 +28,14 @@
  * 6.. - extremely detailed spamming
  */
 
-void debug_print(const char *dbg, const char *buf);
-
 /**
  * Ouptut a line of debugging information.
  * @param name The category of debug information.
  * @param level The maximum debug level this message should be shown at. When the debug level for this category is set lower, then the message will not be shown.
  * @param format_string The formatting string of the message.
  */
-#define Debug(name, level, format_string, ...) if ((level) == 0 || _debug_ ## name ## _level >= (level)) debug_print(#name, fmt::format(FMT_STRING(format_string), ## __VA_ARGS__).c_str())
+#define Debug(name, level, format_string, ...) if ((level) == 0 || _debug_ ## name ## _level >= (level)) DebugPrint(#name, fmt::format(FMT_STRING(format_string), ## __VA_ARGS__))
+void DebugPrint(const char *level, const std::string &message);
 
 extern int _debug_driver_level;
 extern int _debug_grf_level;