diff --git a/newlib/libc/string/strerror.c b/newlib/libc/string/strerror.c
index 5af4f957e..d5f0a3ec9 100644
--- a/newlib/libc/string/strerror.c
+++ b/newlib/libc/string/strerror.c
@@ -18,7 +18,7 @@ INDEX
 ANSI_SYNOPSIS
 	#include <string.h>
 	char *strerror(int <[errnum]>);
-	char *strerror_l(int <[errnum]>, locale_t locale);
+	char *strerror_l(int <[errnum]>, locale_t <[locale]>);
 	char *_strerror_r(struct _reent <[ptr]>, int <[errnum]>,
 			  int <[internal]>, int *<[error]>);