diff --git a/include/stdio.h b/include/stdio.h
index 422ec8a..e6ea853 100644
--- a/include/stdio.h
+++ b/include/stdio.h
@@ -351,7 +351,7 @@ void	 fcloseall(void);
 void	*fcookie(FILE *);
 char	*fgetln(FILE *, size_t *);
 const char *fmtcheck(const char *, const char *) __format_arg(2);
-__ssize_t __fpending(const FILE *);
+__size_t __fpending(FILE *);
 int	 fpurge(FILE *);
 void	 setbuffer(FILE *, char *, int);
 int	 setlinebuf(FILE *);
diff --git a/lib/libc/stdio/__fpending.c b/lib/libc/stdio/__fpending.c
index 4d5ada2..4ae6291 100644
--- a/lib/libc/stdio/__fpending.c
+++ b/lib/libc/stdio/__fpending.c
@@ -36,8 +36,8 @@
 
 #include "local.h"
 
-__ssize_t
-__fpending(const FILE *fp)
+__size_t
+__fpending(FILE *fp)
 {
 	if (HASUB(fp))
 		return(fp->_up - fp->_bf._base);