diff --git a/base/ape/talk.hoon b/base/ape/talk.hoon
index af03431f66..60e8764717 100644
--- a/base/ape/talk.hoon
+++ b/base/ape/talk.hoon
@@ -918,7 +918,11 @@
             ?~  q.yop  ~ 
             ?~(t.q.yop `i.q.yop `[%mor (flop `(list sole-effect)`q.yop)])
         ==
-    ?~(foc moz [[ost %diff %sole-effect u.foc] moz])
+    ?~  foc 
+      moz 
+    ~&  [%ra-abed-fx-mug `@p`(mug u.foc)]
+    ~&  [%ra-abed-fx u.foc]
+    [[ost %diff %sole-effect u.foc] moz])
   ::
   ++  ra-abet                                           ::  complete core
     ra-abed:ra-axel
diff --git a/base/lib/drum.hoon b/base/lib/drum.hoon
index 74a57d8ba7..763dd2becb 100644
--- a/base/lib/drum.hoon
+++ b/base/lib/drum.hoon
@@ -179,6 +179,7 @@
   ++  diff-sole-effect-phat                             ::
     |=  [way=wire fec=sole-effect]  
     =<  se-abet  =<  se-view
+    ~&  [%diff-effect `@p`(mug fec)]
     =+  gyl=(drum-phat way)
     ?:  (se-aint gyl)  +>.$
     (se-diff gyl fec)