diff --git a/gettext-tools/gnulib-tests/Makefile.am b/gettext-tools/gnulib-tests/Makefile.am
index 7d6b00e54..6d97cfe84 100644
--- a/gettext-tools/gnulib-tests/Makefile.am
+++ b/gettext-tools/gnulib-tests/Makefile.am
@@ -1,5 +1,5 @@
 ## Makefile for the gettext-tools/gnulib-tests subdirectory of GNU gettext
-## Copyright (C) 2007-2023 Free Software Foundation, Inc.
+## Copyright (C) 2007-2025 Free Software Foundation, Inc.
 ##
 ## This program is free software: you can redistribute it and/or modify
 ## it under the terms of the GNU General Public License as published by
@@ -16,6 +16,8 @@
 
 ## Process this file with automake to produce Makefile.in.
 
+AM_CFLAGS =
+
 # Rules generated and collected by gnulib-tool.
 include Makefile.gnulib
 
diff --git a/libtextstyle/tests/Makefile.am b/libtextstyle/tests/Makefile.am
index 853d8f785..785623be1 100644
--- a/libtextstyle/tests/Makefile.am
+++ b/libtextstyle/tests/Makefile.am
@@ -1,5 +1,5 @@
 ## Makefile for the tests subdirectory of GNU libtextstyle.
-## Copyright (C) 2009-2020 Free Software Foundation, Inc.
+## Copyright (C) 2009-2025 Free Software Foundation, Inc.
 ##
 ## This program is free software: you can redistribute it and/or modify
 ## it under the terms of the GNU General Public License as published by
@@ -16,6 +16,8 @@
 
 ## Process this file with automake to produce Makefile.in.
 
+AM_CFLAGS =
+
 # Rules generated and collected by gnulib-tool.
 include Makefile.gnulib