diff --git a/include/magic_enum.hpp b/include/magic_enum.hpp
index 12ae221..ceb4a08 100644
--- a/include/magic_enum.hpp
+++ b/include/magic_enum.hpp
@@ -29,7 +29,8 @@
 // OUT OF OR IN CONNECTION WITH THE SOFTWARE  OR THE USE OR OTHER DEALINGS IN THE
 // SOFTWARE.
 
-#pragma once
+#ifndef MAGIC_ENUM_HPP
+#define MAGIC_ENUM_HPP
 
 #include <array>
 #include <cassert>
@@ -352,3 +353,5 @@ std::basic_ostream<Char, Traits>& operator<<(std::basic_ostream<Char, Traits>& o
 } // namespace magic_enum::ops
 
 } // namespace magic_enum
+
+#endif // MAGIC_ENUM_HPP