diff --git a/cif/org.eclipse.escet.cif.tests/tests/pprint_elim_cdef/import_sym_warn.cif b/cif/org.eclipse.escet.cif.tests/tests/pprint_elim_cdef/import_sym_warn.cif
index e411c329eedee4c99f559ebbfaf7ff12a594dd29..fbc82ad3ad8efccbdd49e3d675dd09b7557c2da7 100644
--- a/cif/org.eclipse.escet.cif.tests/tests/pprint_elim_cdef/import_sym_warn.cif
+++ b/cif/org.eclipse.escet.cif.tests/tests/pprint_elim_cdef/import_sym_warn.cif
@@ -1 +1,14 @@
+//////////////////////////////////////////////////////////////////////////////
+// Copyright (c) 2010, 2021 Contributors to the Eclipse Foundation
+//
+// See the NOTICE file(s) distributed with this work for additional
+// information regarding copyright ownership.
+//
+// This program and the accompanying materials are made available
+// under the terms of the MIT License which is available at
+// https://opensource.org/licenses/MIT
+//
+// SPDX-License-Identifier: MIT
+//////////////////////////////////////////////////////////////////////////////
+
 import "enums1.cif";
diff --git a/misc/license-header/license-header-check.bash b/misc/license-header/license-header-check.bash
index 01c3ed780bd775ce758858abf4c5177ab3db3329..5178a1067082aa63bc0edbf2927d8ed681e2ad98 100755
--- a/misc/license-header/license-header-check.bash
+++ b/misc/license-header/license-header-check.bash
@@ -203,7 +203,7 @@ POST_EXCLUDE_PATTERN="$POST_EXCLUDE_PATTERN|^./.Xauthority-.*:0$"
 
 # Get license header count per file, using copyright statement from license header.
 # Exclude ones with exactly one match, as that is the expected/desired situation.
-grep -r -c $EXCLUDE_ARGS "Copyright (c) 2010, 2021 Contributors to the Eclipse Foundation" . | \
+grep -r -c $EXCLUDE_ARGS -E "Copyright \(c\) ([0-9]{4}, )?2021 Contributors to the Eclipse Foundation" . | \
     grep -v "^.*:1$" | grep -v -E $POST_EXCLUDE_PATTERN > misc/license-header/license-header-list.txt
 
 # Print/check results.
diff --git a/releng/org.eclipse.escet.configuration/checkstyle.xml b/releng/org.eclipse.escet.configuration/checkstyle.xml
index fcd1858e4f0071928df861397129bf4ba6cb1933..f230e503bdb6cdc5167fe2c18a0cdaba507ddc4f 100644
--- a/releng/org.eclipse.escet.configuration/checkstyle.xml
+++ b/releng/org.eclipse.escet.configuration/checkstyle.xml
@@ -275,7 +275,7 @@ SPDX-License-Identifier: MIT
   </module>
   <module name="UniqueProperties"/>
   <module name="RegexpHeader">
-    <property name="header" value="^//////////////////////////////////////////////////////////////////////////////$\n^// Copyright \(c\) 2010, \d\d\d\d Contributors to the Eclipse Foundation$\n^//$\n^// See the NOTICE file\(s\) distributed with this work for additional$\n^// information regarding copyright ownership.$\n^//$\n^// This program and the accompanying materials are made available$\n^// under the terms of the MIT License which is available at$\n^// https://opensource.org/licenses/MIT$\n^//$\n^// SPDX-License-Identifier: MIT$\n^//////////////////////////////////////////////////////////////////////////////$"/>
+    <property name="header" value="^//////////////////////////////////////////////////////////////////////////////$\n^// Copyright \(c\) (\d\d\d\d, )?\d\d\d\d Contributors to the Eclipse Foundation$\n^//$\n^// See the NOTICE file\(s\) distributed with this work for additional$\n^// information regarding copyright ownership.$\n^//$\n^// This program and the accompanying materials are made available$\n^// under the terms of the MIT License which is available at$\n^// https://opensource.org/licenses/MIT$\n^//$\n^// SPDX-License-Identifier: MIT$\n^//////////////////////////////////////////////////////////////////////////////$"/>
     <property name="fileExtensions" value="java"/>
   </module>
 </module>