diff --git a/contrib/pg_upgrade/pg_upgrade.c b/contrib/pg_upgrade/pg_upgrade.c
index d706fc0b03..25d732b247 100644
--- a/contrib/pg_upgrade/pg_upgrade.c
+++ b/contrib/pg_upgrade/pg_upgrade.c
@@ -259,7 +259,6 @@ copy_clog_xlog_xid(void)
 	check_ok();
 
 	prep_status("Copying old commit clogs to new server");
-	/* libpgport's copydir() doesn't work in FRONTEND code */
 #ifndef WIN32
 	exec_prog(true, SYSTEMQUOTE "%s \"%s\" \"%s\"" SYSTEMQUOTE,
 			  "cp -Rf",
diff --git a/src/backend/commands/dbcommands.c b/src/backend/commands/dbcommands.c
index 6193aa2884..8cbd7548f9 100644
--- a/src/backend/commands/dbcommands.c
+++ b/src/backend/commands/dbcommands.c
@@ -44,6 +44,7 @@
 #include "pgstat.h"
 #include "postmaster/bgwriter.h"
 #include "storage/bufmgr.h"
+#include "storage/copydir.h"
 #include "storage/fd.h"
 #include "storage/lmgr.h"
 #include "storage/ipc.h"
diff --git a/src/backend/storage/file/copydir.c b/src/backend/storage/file/copydir.c
index a9715f3c7d..4a10563ef8 100644
--- a/src/backend/storage/file/copydir.c
+++ b/src/backend/storage/file/copydir.c
@@ -22,6 +22,7 @@
 #include <unistd.h>
 #include <sys/stat.h>
 
+#include "storage/copydir.h"
 #include "storage/fd.h"
 #include "miscadmin.h"
 
diff --git a/src/include/port.h b/src/include/port.h
index f4aa69c8f6..204876888a 100644
--- a/src/include/port.h
+++ b/src/include/port.h
@@ -288,8 +288,6 @@ extern int	pgsymlink(const char *oldpath, const char *newpath);
 #define symlink(oldpath, newpath)	pgsymlink(oldpath, newpath)
 #endif
 
-extern void copydir(char *fromdir, char *todir, bool recurse);
-
 extern bool rmtree(const char *path, bool rmtopdir);
 
 /*
diff --git a/src/include/storage/copydir.h b/src/include/storage/copydir.h
new file mode 100644
index 0000000000..194d98ee07
--- /dev/null
+++ b/src/include/storage/copydir.h
@@ -0,0 +1,18 @@
+/*-------------------------------------------------------------------------
+ *
+ * port.h
+ *	  Header for src/port/ compatibility functions.
+ *
+ * Portions Copyright (c) 1996-2010, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * src/include/port.h
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef COPYDIR_H
+#define COPYDIR_H
+
+extern void copydir(char *fromdir, char *todir, bool recurse);
+
+#endif   /* COPYDIR_H */