diff --git a/src/system/libroot/posix/unistd/_exit.c b/src/system/libroot/posix/unistd/_exit.c
index f243fe6041..cd22e1bb4a 100644
--- a/src/system/libroot/posix/unistd/_exit.c
+++ b/src/system/libroot/posix/unistd/_exit.c
@@ -8,8 +8,7 @@
 #include <syscalls.h>
 
 
-extern void (*_IO_cleanup)(void);
-
+extern void _IO_cleanup(void);
 
 void
 _exit(int status)