diff --git a/include/gsl/dyn_array b/include/gsl/dyn_array
index 550cc26b..bb961609 100644
--- a/include/gsl/dyn_array
+++ b/include/gsl/dyn_array
@@ -26,6 +26,7 @@
 #include <iterator>
 #include <memory>
 #include <type_traits>
+#include <vector>
 
 #if defined(__cpp_lib_ranges) && (__cpp_lib_ranges >= 201911L)
 #include <ranges>
diff --git a/include/gsl/gsl b/include/gsl/gsl
index 157ef6c1..3321faaa 100644
--- a/include/gsl/gsl
+++ b/include/gsl/gsl
@@ -21,6 +21,7 @@
 #include "./algorithm" // copy
 #include "./assert"    // Ensures/Expects
 #include "./byte"      // byte
+#include "./dyn_array" // dyn_array
 #include "./pointers"  // owner, not_null
 #include "./span"      // span
 #include "./util"      // finally()/narrow_cast()...