--- a/o2info/operations.c
+++ b/o2info/operations.c
@@ -24,6 +24,7 @@
 #include <errno.h>
 #include <linux/raw.h>
 #include <inttypes.h>
+#include <sys/ioctl.h>
 
 #include "ocfs2/ocfs2.h"
 #include "ocfs2/bitops.h"