1 files changed, 1 insertions, 0 deletions
diff --git a/src/proc.c b/src/proc.c
index 1ae1d495e..93354dd16 100644
--- a/src/proc.c
+++ b/src/proc.c
@@ -70,6 +70,7 @@ mrb_proc_new_cfunc(mrb_state *mrb, mrb_func_t func)
   p = (struct RProc*)mrb_obj_alloc(mrb, MRB_TT_PROC, mrb->proc_class);
   p->body.func = func;
   p->flags |= MRB_PROC_CFUNC;
+  p->env = 0;
 
   return p;
 }