diff --git a/include/gsl/span b/include/gsl/span
index c011d76..b4e791f 100644
--- a/include/gsl/span
+++ b/include/gsl/span
@@ -19,7 +19,6 @@
 
 #include <gsl/gsl_assert> // for Expects
 #include <gsl/gsl_byte>   // for byte
-#include <gsl/gsl_util>   // for narrow_cast, narrow
 
 #include <array>       // for array
 #include <cstddef>     // for ptrdiff_t, size_t, nullptr_t