diff --git a/dev-libs/libqtxdg/libqtxdg-4.0.0.ebuild b/dev-libs/libqtxdg/libqtxdg-4.0.0.ebuild
index af2c3cca1d585..2406c2d76861e 100644
--- a/dev-libs/libqtxdg/libqtxdg-4.0.0.ebuild
+++ b/dev-libs/libqtxdg/libqtxdg-4.0.0.ebuild
@@ -1,4 +1,4 @@
-# Copyright 1999-2024 Gentoo Authors
+# Copyright 1999-2025 Gentoo Authors
 # Distributed under the terms of the GNU General Public License v2
 
 EAPI=8
@@ -43,7 +43,7 @@ src_configure() {
 
 src_test() {
 	# Tests don't work with C
-	LC_ALL=en_US.utf8 virtx cmake_src_test
+	LC_ALL=en_US.UTF-8 virtx cmake_src_test
 }
 
 pkg_postinst() {
diff --git a/dev-libs/libqtxdg/libqtxdg-4.0.1.ebuild b/dev-libs/libqtxdg/libqtxdg-4.0.1.ebuild
index 36d76701144bd..2406c2d76861e 100644
--- a/dev-libs/libqtxdg/libqtxdg-4.0.1.ebuild
+++ b/dev-libs/libqtxdg/libqtxdg-4.0.1.ebuild
@@ -43,7 +43,7 @@ src_configure() {
 
 src_test() {
 	# Tests don't work with C
-	LC_ALL=en_US.utf8 virtx cmake_src_test
+	LC_ALL=en_US.UTF-8 virtx cmake_src_test
 }
 
 pkg_postinst() {
diff --git a/dev-libs/libqtxdg/libqtxdg-4.1.0.ebuild b/dev-libs/libqtxdg/libqtxdg-4.1.0.ebuild
index de59799ee0df2..cd56d4d9b9465 100644
--- a/dev-libs/libqtxdg/libqtxdg-4.1.0.ebuild
+++ b/dev-libs/libqtxdg/libqtxdg-4.1.0.ebuild
@@ -43,7 +43,7 @@ src_configure() {
 
 src_test() {
 	# Tests don't work with C
-	LC_ALL=en_US.utf8 virtx cmake_src_test
+	LC_ALL=en_US.UTF-8 virtx cmake_src_test
 }
 
 pkg_postinst() {
diff --git a/dev-libs/libqtxdg/libqtxdg-4.2.0.ebuild b/dev-libs/libqtxdg/libqtxdg-4.2.0.ebuild
index 58deeaa6c4d00..957bd1a3f0371 100644
--- a/dev-libs/libqtxdg/libqtxdg-4.2.0.ebuild
+++ b/dev-libs/libqtxdg/libqtxdg-4.2.0.ebuild
@@ -43,7 +43,7 @@ src_configure() {
 
 src_test() {
 	# Tests don't work with C
-	LC_ALL=en_US.utf8 virtx cmake_src_test
+	LC_ALL=en_US.UTF-8 virtx cmake_src_test
 }
 
 pkg_postinst() {