diff --git a/example/literals/geographic.h b/example/literals/geographic.h
index 430e1fbb..f5ee6bd1 100644
--- a/example/literals/geographic.h
+++ b/example/literals/geographic.h
@@ -22,6 +22,7 @@
 
 #pragma once
 
+#include <units/bits/external/hacks.h> // IWYU pragma: keep
 #include <units/isq/si/length.h>
 #include <units/quantity_kind.h>