diff --git a/src/constexpr_string.cpp b/src/constexpr_string.cpp
index f736c55..6cd0337 100644
--- a/src/constexpr_string.cpp
+++ b/src/constexpr_string.cpp
@@ -33,7 +33,7 @@ struct ConstexprString {
     std::ranges::copy_n(data, Size, this->data.begin());
   };
   explicit constexpr ConstexprString(std::string_view data) : data{} {
-    std::ranges::copy_n(data.begin(), Size, this->data.begin());
+    std::ranges::copy_n(data.begin(), data.size() > this->size() ? this->size() : data.size(), this->data.begin());
   };
   explicit constexpr ConstexprString(std::array<char, Size> data) : data(std::move(data)) {};
   constexpr auto size() const {