diff --git a/src/fd_util.h b/src/fd_util.h
index 5b80df2c7..647860a97 100644
--- a/src/fd_util.h
+++ b/src/fd_util.h
@@ -36,6 +36,8 @@
 #ifndef FD_UTIL_H
 #define FD_UTIL_H
 
+#include "check.h"
+
 #include <stdbool.h>
 #include <stddef.h>