diff --git a/libcxx/test/std/re/re.alg/re.alg.match/awk.pass.cpp b/libcxx/test/std/re/re.alg/re.alg.match/awk.pass.cpp
index 43fc9b89cb85..c3464e123e72 100644
--- a/libcxx/test/std/re/re.alg/re.alg.match/awk.pass.cpp
+++ b/libcxx/test/std/re/re.alg/re.alg.match/awk.pass.cpp
@@ -19,6 +19,7 @@
 // TODO: investigation needed
 // TODO(netbsd): incomplete support for locales
 // XFAIL: linux-gnu, netbsd
+// REQUIRES: locale.cs_CZ.ISO8859-2
 
 #include <regex>
 #include <cassert>