diff --git a/pw_span/public/pw_span/span.h b/pw_span/public/pw_span/span.h
index af0c63b..69c5521 100644
--- a/pw_span/public/pw_span/span.h
+++ b/pw_span/public/pw_span/span.h
@@ -42,6 +42,6 @@
 #else
 
 // If std::span is not available, use Pigweed's span implementation.
-#include "pw_span/internal/span_impl.h"
+#include "pw_span/internal/span_impl.h"  // IWYU pragma: export
 
 #endif  // defined(__cpp_lib_span) && __cpp_lib_span >= 202002L