diff --git a/include/crucible/openat2.h b/include/crucible/openat2.h
index 8d35350..c408118 100644
--- a/include/crucible/openat2.h
+++ b/include/crucible/openat2.h
@@ -12,6 +12,8 @@
 
 #else
 
+#include <linux/types.h>
+
 #ifndef RESOLVE_NO_XDEV
 #define RESOLVE_NO_XDEV 1