diff --git a/headers/os/kernel/OS.h b/headers/os/kernel/OS.h
index 301686e9e2..0c6855587e 100644
--- a/headers/os/kernel/OS.h
+++ b/headers/os/kernel/OS.h
@@ -424,9 +424,9 @@ extern void			debugger(const char *message);
 extern int			disable_debugger(int state);
 
 /* TODO: Remove. Temporary debug helper. */
-extern void			debug_printf(const char *format, ...)
+extern int			debug_printf(const char *format, ...)
 						__attribute__ ((format (__printf__, 1, 2)));
-extern void			debug_vprintf(const char *format, va_list args);
+extern int			debug_vprintf(const char *format, va_list args);
 extern void			ktrace_printf(const char *format, ...)
 						__attribute__ ((format (__printf__, 1, 2)));
 extern void			ktrace_vprintf(const char *format, va_list args);
diff --git a/src/system/libroot/os/debug.c b/src/system/libroot/os/debug.c
index 2e7a5c7be6..5dc12397f8 100644
--- a/src/system/libroot/os/debug.c
+++ b/src/system/libroot/os/debug.c
@@ -268,27 +268,32 @@ _debuggerAssert(const char *file, int line, const char *message)
 	return 0;
 }
 
+
 // TODO: Remove. Temporary debug helper.
 // (accidently these are more or less the same as _sPrintf())
-
-void
+int
 debug_printf(const char *format, ...)
 {
+	int count;
+
 	va_list list;
 	va_start(list, format);
 
-	debug_vprintf(format, list);
+	count = debug_vprintf(format, list);
 
 	va_end(list);
+	return count;
 }
 
-void
+
+int
 debug_vprintf(const char *format, va_list args)
 {
 	char buffer[1024];
-	vsnprintf(buffer, sizeof(buffer), format, args);
+	int count = vsnprintf(buffer, sizeof(buffer), format, args);
 
 	_kern_debug_output(buffer);
+	return count;
 }