diff --git a/extra/mason/common/common.factor b/extra/mason/common/common.factor
index 5e37a683cf..db68a558e0 100644
--- a/extra/mason/common/common.factor
+++ b/extra/mason/common/common.factor
@@ -57,7 +57,6 @@ M: unix really-delete-tree delete-tree ;
             [ day>> , ]
             [ hour>> , ]
             [ minute>> , ]
-            [ drop nano-count , ]
         } cleave
     ] { } make [ pad-00 ] map "-" join ;