diff --git a/lib/libc/stdio/findfp.c b/lib/libc/stdio/findfp.c
index 8dc8053c62d7..0eabe82d753f 100644
--- a/lib/libc/stdio/findfp.c
+++ b/lib/libc/stdio/findfp.c
@@ -113,7 +113,7 @@ moreglue(int n)
  * Find a free FILE for fopen et al.
  */
 FILE *
-__sfp()
+__sfp(void)
 {
 	FILE	*fp;
 	int	n;
@@ -164,7 +164,7 @@ __sfp()
  */
 __warn_references(f_prealloc, 
 	"warning: this program uses f_prealloc(), which is not recommended.");
-void f_prealloc_void();
+void f_prealloc(void);
 
 void
 f_prealloc(void)
@@ -196,7 +196,7 @@ f_prealloc(void)
  * The name `_cleanup' is, alas, fairly well known outside stdio.
  */
 void
-_cleanup()
+_cleanup(void)
 {
 	/* (void) _fwalk(fclose); */
 	(void) _fwalk(__sflush);		/* `cheating' */
@@ -206,7 +206,7 @@ _cleanup()
  * __sinit() is called whenever stdio's internal variables must be set up.
  */
 void
-__sinit()
+__sinit(void)
 {
 
 	/* Make sure we clean up on exit. */
diff --git a/lib/libc/stdio/getchar.c b/lib/libc/stdio/getchar.c
index 21040bc8c416..2815072f866e 100644
--- a/lib/libc/stdio/getchar.c
+++ b/lib/libc/stdio/getchar.c
@@ -49,7 +49,7 @@ __FBSDID("$FreeBSD$");
 #undef getchar_unlocked
 
 int
-getchar()
+getchar(void)
 {
 	int retval;
 	FLOCKFILE(stdin);
diff --git a/lib/libc/stdio/vfscanf.c b/lib/libc/stdio/vfscanf.c
index 50f0690b6678..b5372631840b 100644
--- a/lib/libc/stdio/vfscanf.c
+++ b/lib/libc/stdio/vfscanf.c
@@ -814,9 +814,7 @@ again:		c = *fmt++;
  * considered part of the scanset.
  */
 static const u_char *
-__sccl(tab, fmt)
-	char *tab;
-	const u_char *fmt;
+__sccl(char *tab, const u_char *fmt)
 {
 	int c, n, v, i;
 	struct xlocale_collate *table =