diff --git a/contrib/basic_archive/basic_archive.c b/contrib/basic_archive/basic_archive.c
index 28cbb6cce0e..3d29711a316 100644
--- a/contrib/basic_archive/basic_archive.c
+++ b/contrib/basic_archive/basic_archive.c
@@ -275,7 +275,7 @@ basic_archive_file_internal(const char *file, const char *path)
 	 * Copy the file to its temporary destination.  Note that this will fail
 	 * if temp already exists.
 	 */
-	copy_file(unconstify(char *, path), temp);
+	copy_file(path, temp);
 
 	/*
 	 * Sync the temporary file to disk and move it to its final destination.
diff --git a/src/backend/storage/file/copydir.c b/src/backend/storage/file/copydir.c
index 7782e266772..e04bc3941ae 100644
--- a/src/backend/storage/file/copydir.c
+++ b/src/backend/storage/file/copydir.c
@@ -34,7 +34,7 @@
  * a directory or a regular file is ignored.
  */
 void
-copydir(char *fromdir, char *todir, bool recurse)
+copydir(const char *fromdir, const char *todir, bool recurse)
 {
 	DIR		   *xldir;
 	struct dirent *xlde;
@@ -114,7 +114,7 @@ copydir(char *fromdir, char *todir, bool recurse)
  * copy one file
  */
 void
-copy_file(char *fromfile, char *tofile)
+copy_file(const char *fromfile, const char *tofile)
 {
 	char	   *buffer;
 	int			srcfd;
diff --git a/src/include/storage/copydir.h b/src/include/storage/copydir.h
index 713b732da23..a8be5b21e0b 100644
--- a/src/include/storage/copydir.h
+++ b/src/include/storage/copydir.h
@@ -13,7 +13,7 @@
 #ifndef COPYDIR_H
 #define COPYDIR_H
 
-extern void copydir(char *fromdir, char *todir, bool recurse);
-extern void copy_file(char *fromfile, char *tofile);
+extern void copydir(const char *fromdir, const char *todir, bool recurse);
+extern void copy_file(const char *fromfile, const char *tofile);
 
 #endif							/* COPYDIR_H */