diff --git a/lib/isc/Makefile.am b/lib/isc/Makefile.am
index 79f71c1b85..71712754c1 100644
--- a/lib/isc/Makefile.am
+++ b/lib/isc/Makefile.am
@@ -222,6 +222,7 @@ libisc_la_SOURCES =		\
 	pthreads/thread.c	\
 	entropy_private.h	\
 	fsaccess_common_p.h	\
+	lib_p.h			\
 	mem_p.h			\
 	task_p.h		\
 	tls_p.h
diff --git a/lib/isc/lib_p.h b/lib/isc/lib_p.h
new file mode 100644
index 0000000000..5c330bea3c
--- /dev/null
+++ b/lib/isc/lib_p.h
@@ -0,0 +1,18 @@
+/*
+ * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, you can obtain one at https://mozilla.org/MPL/2.0/.
+ *
+ * See the COPYRIGHT file distributed with this work for additional
+ * information regarding copyright ownership.
+ */
+
+#pragma once
+
+void
+isc__initialize(void);
+
+void
+isc__shutdown(void);
diff --git a/lib/isc/win32/DLLMain.c b/lib/isc/win32/DLLMain.c
index 187e84fbcd..22a3e0512c 100644
--- a/lib/isc/win32/DLLMain.c
+++ b/lib/isc/win32/DLLMain.c
@@ -16,9 +16,7 @@
 #include <isc/tls.h>
 #include <isc/util.h>
 
-#include "mem_p.h"
-#include "tls_p.h"
-#include "trampoline_p.h"
+#include "lib_p.h"
 
 /*
  * Called when we enter the DLL
@@ -31,9 +29,7 @@ __declspec(dllexport) BOOL WINAPI
 	 * LoadLibrary.
 	 */
 	case DLL_PROCESS_ATTACH:
-		isc__mem_initialize();
-		isc__tls_initialize();
-		isc__trampoline_initialize();
+		isc__initialize();
 		break;
 
 	/*
@@ -41,9 +37,7 @@ __declspec(dllexport) BOOL WINAPI
 	 * termination or a call to FreeLibrary.
 	 */
 	case DLL_PROCESS_DETACH:
-		isc__trampoline_shutdown();
-		isc__tls_shutdown();
-		isc__mem_shutdown();
+		isc__shutdown();
 		break;
 
 	case DLL_THREAD_ATTACH:
diff --git a/util/copyrights b/util/copyrights
index 89617bf07f..ac7cb8e8d0 100644
--- a/util/copyrights
+++ b/util/copyrights
@@ -1900,6 +1900,7 @@
 ./lib/isc/iterated_hash.c			C	2006,2008,2009,2016,2018,2019,2020,2021
 ./lib/isc/lex.c					C	1998,1999,2000,2001,2002,2003,2004,2005,2007,2013,2014,2015,2016,2017,2018,2019,2020,2021
 ./lib/isc/lib.c					C	1999,2000,2001,2004,2005,2007,2009,2013,2014,2015,2016,2018,2019,2020,2021
+./lib/isc/lib_p.h				C	2021
 ./lib/isc/log.c					C	1999,2000,2001,2002,2003,2004,2005,2006,2007,2009,2011,2012,2013,2014,2016,2017,2018,2019,2020,2021
 ./lib/isc/md.c					C	2018,2019,2020,2021
 ./lib/isc/mem.c					C	1997,1998,1999,2000,2001,2002,2003,2004,2005,2006,2007,2008,2009,2010,2012,2013,2014,2015,2016,2017,2018,2019,2020,2021