1 files changed, 2 insertions, 2 deletions
diff --git a/pp_sys.c b/pp_sys.c
index 7122499b5d..1a75bbbffc 100644
--- a/pp_sys.c
+++ b/pp_sys.c
@@ -1306,7 +1306,7 @@ PP(pp_enterwrite)
 	DIE(aTHX_ "Not a format reference");
     }
     if (CvCLONE(cv))
-	cv = (CV*)sv_2mortal((SV*)cv_clone(cv));
+	cv = MUTABLE_CV(sv_2mortal((SV*)cv_clone(cv)));
 
     IoFLAGS(io) &= ~IOf_DIDTOP;
     return doform(cv,gv,PL_op->op_next);
@@ -1397,7 +1397,7 @@ PP(pp_leavewrite)
 		DIE(aTHX_ "Undefined top format called");
 	}
 	if (cv && CvCLONE(cv))
-	    cv = (CV*)sv_2mortal((SV*)cv_clone(cv));
+	    cv = MUTABLE_CV(sv_2mortal((SV*)cv_clone(cv)));
 	return doform(cv, gv, PL_op);
     }