diff --git a/fmt_str.c b/fmt_str.c
index 48930cf8..423b5ca6 100644
--- a/fmt_str.c
+++ b/fmt_str.c
@@ -1,7 +1,6 @@
 #include "fmt.h"
 
-unsigned int fmt_str(s,t)
-register char *s; register char *t;
+unsigned int fmt_str(char *s, char *t)
 {
   register unsigned int len;
   char ch;
diff --git a/fmt_strn.c b/fmt_strn.c
index 3ef58a64..03be4c07 100644
--- a/fmt_strn.c
+++ b/fmt_strn.c
@@ -1,7 +1,6 @@
 #include "fmt.h"
 
-unsigned int fmt_strn(s,t,n)
-register char *s; register char *t; register unsigned int n;
+unsigned int fmt_strn(char *s, char *t, unsigned int n)
 {
   register unsigned int len;
   char ch;
diff --git a/fmt_uint.c b/fmt_uint.c
index 8595be8c..ab344317 100644
--- a/fmt_uint.c
+++ b/fmt_uint.c
@@ -1,6 +1,6 @@
 #include "fmt.h"
 
-unsigned int fmt_uint(s,u) register char *s; register unsigned int u;
+unsigned int fmt_uint(char *s, unsigned int u)
 {
   register unsigned long l; l = u; return fmt_ulong(s,l);
 }
diff --git a/fmt_uint0.c b/fmt_uint0.c
index 81705f64..7abb3067 100644
--- a/fmt_uint0.c
+++ b/fmt_uint0.c
@@ -1,6 +1,6 @@
 #include "fmt.h"
 
-unsigned int fmt_uint0(s,u,n) char *s; unsigned int u; unsigned int n;
+unsigned int fmt_uint0(char *s, unsigned int u, unsigned int n)
 {
   unsigned int len;
   len = fmt_uint(FMT_LEN,u);
diff --git a/fmt_ulong.c b/fmt_ulong.c
index ab12e8c9..0edf9437 100644
--- a/fmt_ulong.c
+++ b/fmt_ulong.c
@@ -1,6 +1,6 @@
 #include "fmt.h"
 
-unsigned int fmt_ulong(s,u) register char *s; register unsigned long u;
+unsigned int fmt_ulong(char *s, unsigned long u)
 {
   register unsigned int len; register unsigned long q;
   len = 1; q = u;