diff --git a/lib/libc/mingw/misc/strtoimax.c b/lib/libc/mingw/misc/strtoimax.c
index eef5da97cc..9e75f8a275 100644
--- a/lib/libc/mingw/misc/strtoimax.c
+++ b/lib/libc/mingw/misc/strtoimax.c
@@ -31,10 +31,7 @@
 #define valid(n, b)	((n) >= 0 && (n) < (b))
 
 intmax_t
-strtoimax(nptr, endptr, base)
-	register const char * __restrict__	nptr;
-	char ** __restrict__			endptr;
-	register int				base;
+strtoimax(const char * __restrict__ nptr, char ** __restrict__ endptr, int base)
 	{
 	register uintmax_t	accum;	/* accumulates converted value */
 	register int		n;	/* numeral from digit character */
diff --git a/lib/libc/mingw/misc/strtoumax.c b/lib/libc/mingw/misc/strtoumax.c
index e86cd76132..2c24db14d8 100644
--- a/lib/libc/mingw/misc/strtoumax.c
+++ b/lib/libc/mingw/misc/strtoumax.c
@@ -31,10 +31,7 @@
 #define valid(n, b)	((n) >= 0 && (n) < (b))
 
 uintmax_t
-strtoumax(nptr, endptr, base)
-	register const char * __restrict__	nptr;
-	char ** __restrict__			endptr;
-	register int				base;
+strtoumax(const char * __restrict__ nptr, char ** __restrict__ endptr, int base)
 	{
 	register uintmax_t	accum;	/* accumulates converted value */
 	register uintmax_t	next;	/* for computing next value of accum */
diff --git a/lib/libc/mingw/misc/wcstoimax.c b/lib/libc/mingw/misc/wcstoimax.c
index 9821cf07cc..99e97b9214 100644
--- a/lib/libc/mingw/misc/wcstoimax.c
+++ b/lib/libc/mingw/misc/wcstoimax.c
@@ -33,10 +33,7 @@
 #define valid(n, b)	((n) >= 0 && (n) < (b))
 
 intmax_t
-wcstoimax(nptr, endptr, base)
-	register const wchar_t * __restrict__	nptr;
-	wchar_t ** __restrict__				endptr;
-	register int					base;
+wcstoimax(const wchar_t * __restrict__ nptr, wchar_t ** __restrict__ endptr, int base)
 	{
 	register uintmax_t	accum;	/* accumulates converted value */
 	register int		n;	/* numeral from digit character */
diff --git a/lib/libc/mingw/misc/wcstoumax.c b/lib/libc/mingw/misc/wcstoumax.c
index 0f1ed540c2..97f2c30833 100644
--- a/lib/libc/mingw/misc/wcstoumax.c
+++ b/lib/libc/mingw/misc/wcstoumax.c
@@ -33,10 +33,7 @@
 #define valid(n, b)	((n) >= 0 && (n) < (b))
 
 uintmax_t
-wcstoumax(nptr, endptr, base)
-	register const wchar_t * __restrict__	nptr;
-	wchar_t ** __restrict__				endptr;
-	register int					base;
+wcstoumax(const wchar_t * __restrict__ nptr, wchar_t ** __restrict__ endptr, int base)
 	{
 	register uintmax_t	accum;	/* accumulates converted value */
 	register uintmax_t	next;	/* for computing next value of accum */