diff --git a/fio.h b/fio.h
index 4bb1f6c..2f41eda 100644
--- a/fio.h
+++ b/fio.h
@@ -217,6 +217,7 @@
 	unsigned int hugepage_size;
 	unsigned int rw_min_bs;
 	unsigned int thinktime;
+	unsigned int thinktime_blocks;
 	unsigned int fsync_blocks;
 	unsigned int start_delay;
 	unsigned long timeout;