diff --git a/src/osd/osd_types.cc b/src/osd/osd_types.cc
index 2a531b2ab3d..2ed12308d3a 100644
--- a/src/osd/osd_types.cc
+++ b/src/osd/osd_types.cc
@@ -6240,6 +6240,7 @@ ostream& operator<<(ostream& out, const OSDOp& op)
     case CEPH_OSD_OP_ZERO:
     case CEPH_OSD_OP_APPEND:
     case CEPH_OSD_OP_MAPEXT:
+    case CEPH_OSD_OP_CMPEXT:
       out << " " << op.op.extent.offset << "~" << op.op.extent.length;
       if (op.op.extent.truncate_seq)
 	out << " [" << op.op.extent.truncate_seq << "@"