From 30c5ffd7032098d03b3838354d5a34b7ac4253fb Mon Sep 17 00:00:00 2001
From: Valentin Churavy <v.churavy@gmail.com>
Date: Fri, 13 Sep 2024 14:18:22 +0200
Subject: [PATCH] fix default

---
 src/operators.jl | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/operators.jl b/src/operators.jl
index 4aca305f5..7fdaa7779 100644
--- a/src/operators.jl
+++ b/src/operators.jl
@@ -159,7 +159,7 @@ macro RegisterOp(f, T)
             end
             import MPI: Op
             # we can't create a const Op since MPI needs to be initialized?
-            function Op(::typeof($f), ::Type{<:$T}; iscommutative=true)
+            function Op(::typeof($f), ::Type{<:$T}; iscommutative=false)
                 op = Op($OP_NULL.val, $(name_fptr)[])
                 # int MPI_Op_create(MPI_User_function* user_fn, int commute, MPI_Op* op)
                 $API.MPI_Op_create($(name_fptr)[], iscommutative, op)