diff --git a/include/sigar_private.h b/include/sigar_private.h
index 45ab0df4..ad5ba4b7 100644
--- a/include/sigar_private.h
+++ b/include/sigar_private.h
@@ -325,8 +325,8 @@ int sigar_group_name_get(sigar_t *sigar, int gid, char *buf, int buflen);
 #define SIGAR_DISK_STATS_INIT(disk) \
     (disk)->reads = (disk)->writes = \
     (disk)->read_bytes = (disk)->write_bytes = \
-    (disk)->queue = (disk)->time = \
-    (disk)->service_time = SIGAR_FIELD_NOTIMPL; \
+    (disk)->rtime = (disk)->wtime = (disk)->qtime = (disk)->time = \
+    (disk)->queue = (disk)->service_time = SIGAR_FIELD_NOTIMPL; \
     (disk)->snaptime = 0
 
 /* key used for filesystem (/) -> device (/dev/hda1) mapping */