diff --git a/include/libgen.h b/include/libgen.h
index 28c0067a27d..5edf19e34a6 100644
--- a/include/libgen.h
+++ b/include/libgen.h
@@ -34,9 +34,9 @@
 #include <sys/cdefs.h>
 
 __BEGIN_DECLS
-char	*basename(const char *);
+char	*basename(char *);
 char	*basename_r(const char *, char *);
-char	*dirname(const char *);
+char	*dirname(char *);
 __END_DECLS
 
 #endif /* !_LIBGEN_H_ */
diff --git a/lib/libc/gen/basename.3 b/lib/libc/gen/basename.3
index bcdd99e30a8..859f1047f84 100644
--- a/lib/libc/gen/basename.3
+++ b/lib/libc/gen/basename.3
@@ -16,7 +16,7 @@
 .\"
 .\" $FreeBSD$
 .\"
-.Dd March 31, 2010
+.Dd July 28, 2016
 .Dt BASENAME 3
 .Os
 .Sh NAME
@@ -25,7 +25,7 @@
 .Sh SYNOPSIS
 .In libgen.h
 .Ft char *
-.Fn basename "const char *path"
+.Fn basename "char *path"
 .Ft char *
 .Fn basename_r "const char *path" "char *bname"
 .Sh DESCRIPTION
diff --git a/lib/libc/gen/basename.c b/lib/libc/gen/basename.c
index f2bfe5f3e7c..7e21ca4aa30 100644
--- a/lib/libc/gen/basename.c
+++ b/lib/libc/gen/basename.c
@@ -66,7 +66,7 @@ basename_r(const char *path, char *bname)
 }
 
 char *
-basename(const char *path)
+basename(char *path)
 {
 	static char *bname = NULL;
 
diff --git a/lib/libc/gen/dirname.3 b/lib/libc/gen/dirname.3
index ba5cce35c40..19e45add0ad 100644
--- a/lib/libc/gen/dirname.3
+++ b/lib/libc/gen/dirname.3
@@ -16,7 +16,7 @@
 .\"
 .\" $FreeBSD$
 .\"
-.Dd October 12, 2006
+.Dd July 28, 2016
 .Dt DIRNAME 3
 .Os
 .Sh NAME
@@ -25,7 +25,7 @@
 .Sh SYNOPSIS
 .In libgen.h
 .Ft char *
-.Fn dirname "const char *path"
+.Fn dirname "char *path"
 .Sh DESCRIPTION
 The
 .Fn dirname
diff --git a/lib/libc/gen/dirname.c b/lib/libc/gen/dirname.c
index 5a94c1aee59..5e0042fd2d1 100644
--- a/lib/libc/gen/dirname.c
+++ b/lib/libc/gen/dirname.c
@@ -26,7 +26,7 @@ __FBSDID("$FreeBSD$");
 #include <sys/param.h>
 
 char *
-dirname(const char *path)
+dirname(char *path)
 {
 	static char *dname = NULL;
 	size_t len;