diff --git a/src/libsystemd/sd-journal/audit-type.h b/src/libsystemd/sd-journal/audit-type.h
index a92567d184..fa43233c69 100644
--- a/src/libsystemd/sd-journal/audit-type.h
+++ b/src/libsystemd/sd-journal/audit-type.h
@@ -5,6 +5,8 @@
 
 #include "sd-forward.h"
 
+#include "alloc-util.h" /* IWYU pragma: keep */
+
 DECLARE_STRING_TABLE_LOOKUP(audit_type, int);
 
 /* This is inspired by DNS TYPEnnn formatting */