diff --git a/src/KingSystem/Utils/FixedString.h b/src/KingSystem/Utils/FixedString.h
index 039df272..1119ac0b 100644
--- a/src/KingSystem/Utils/FixedString.h
+++ b/src/KingSystem/Utils/FixedString.h
@@ -56,13 +56,14 @@ template <auto N, int base = 10>
 constexpr auto Str() {
     constexpr char digits[] = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
 
-    FixedString<([]() constexpr noexcept {
+    constexpr auto len = [] {
         unsigned int len = N > 0 ? 0 : 1;
         for (auto n = N; n; len++, n /= base)
             continue;
         return len;
-    }())>
-        buf{};
+    }();
+
+    FixedString<len> buf{};
 
     auto ptr = buf.data() + buf.length();
     if (N == 0) {
diff --git a/toolchain/musl b/toolchain/musl
index 9a9252a5..25ed8669 160000
--- a/toolchain/musl
+++ b/toolchain/musl
@@ -1 +1 @@
-Subproject commit 9a9252a54a67f54c066966f8f0599c450391bd44
+Subproject commit 25ed8669943bee65a650700d340e451eda2a26ba