diff --git a/include/stdplus/net/addr/ip.hpp b/include/stdplus/net/addr/ip.hpp
index 50fe64c..0323e7d 100644
--- a/include/stdplus/net/addr/ip.hpp
+++ b/include/stdplus/net/addr/ip.hpp
@@ -494,9 +494,12 @@
 struct CompileInAddr : CompileInAddrInt<Addr>
 {
     CharT str[N - 1];
+    static inline void notNullTerminated() {}
 
     constexpr CompileInAddr(const CharT (&str)[N]) noexcept
     {
+        if (str[N - 1] != '\0')
+            notNullTerminated();
         std::copy(str, str + N - 1, this->str);
         this->compile(std::basic_string_view{this->str, N - 1});
     }