diff --git a/src/stream.h b/src/stream.h
index 7029b6c..42e2041 100644
--- a/src/stream.h
+++ b/src/stream.h
@@ -7,6 +7,7 @@
 #pragma once
 
 #include <bit>
+#include <span>
 #include <cassert>
 #include <concepts>
 #include <cstddef>