diff --git a/include/libbb.h b/include/libbb.h
index f12800f..e7806c2 100644
--- a/include/libbb.h
+++ b/include/libbb.h
@@ -40,6 +40,7 @@
 #include <sys/poll.h>
 #include <sys/ioctl.h>
 #include <sys/mman.h>
+#include <sys/resource.h>
 #include <sys/socket.h>
 #include <sys/stat.h>
 #include <sys/time.h>