diff --git a/include/stdplus/str/cexpr.hpp b/include/stdplus/str/cexpr.hpp
index a3d5f1c..c2e804e 100644
--- a/include/stdplus/str/cexpr.hpp
+++ b/include/stdplus/str/cexpr.hpp
@@ -9,8 +9,8 @@
 template <auto f, bool nul>
 consteval auto cexprToStrArr()
 {
-    std::array<typename decltype(f())::value_type, f().size() + (nul ? 1 : 0)>
-        ret;
+    constexpr std::size_t size = f().size();
+    std::array<typename decltype(f())::value_type, size + (nul ? 1 : 0)> ret;
     {
         auto res = f();
         std::copy(res.begin(), res.end(), ret.begin());
diff --git a/test/meson.build b/test/meson.build
index 8e5a4db..8403e0f 100644
--- a/test/meson.build
+++ b/test/meson.build
@@ -14,6 +14,7 @@
   'raw': [stdplus_dep, gmock_dep, gtest_main_dep],
   'signal': [stdplus_dep, gtest_main_dep],
   'str/cat': [stdplus_dep, gtest_main_dep],
+  'str/cexpr': [stdplus_dep, gtest_main_dep],
   'str/maps': [stdplus_dep, gmock_dep, gtest_main_dep],
   'util/cexec': [stdplus_dep, gtest_main_dep],
   'variant': [stdplus_dep, gtest_main_dep],
@@ -21,12 +22,6 @@
   'zstring_view': [stdplus_dep, gtest_main_dep],
 }
 
-if meson.get_compiler('cpp').get_id() != 'clang'
-  gtests += {
-    'str/cexpr': [stdplus_dep, gtest_main_dep],
-  }
-endif
-
 if has_dl
   gtests += {
     'dl': [stdplus_dl_dep, gtest_main_dep],