diff --git a/p11-kit/test-generate-keypair.sh b/p11-kit/test-generate-keypair.sh
index 8fc36738..27a07493 100755
--- a/p11-kit/test-generate-keypair.sh
+++ b/p11-kit/test-generate-keypair.sh
@@ -10,6 +10,9 @@ test "${abs_top_builddir+set}" = set || {
 : ${P11_MODULE_PATH="$abs_top_builddir"/.libs}
 
 setup() {
+	LC_ALL=C
+	export LC_ALL
+
 	testdir=$PWD/test-genkey-$$
 	test -d "$testdir" || mkdir "$testdir"
 	cd "$testdir"