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-rw-r--r--spec/ruby/optional/capi/ext/thread_spec.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/spec/ruby/optional/capi/ext/thread_spec.c b/spec/ruby/optional/capi/ext/thread_spec.c
index b10d557dd5..2f5678cfca 100644
--- a/spec/ruby/optional/capi/ext/thread_spec.c
+++ b/spec/ruby/optional/capi/ext/thread_spec.c
@@ -125,7 +125,7 @@ static VALUE thread_spec_rb_thread_create(VALUE self, VALUE proc, VALUE arg) {
rb_ary_push(args, proc);
rb_ary_push(args, arg);
- return rb_thread_create(thread_spec_call_proc, (void*)args);
+ return rb_thread_create((VALUE (*)(void *))thread_spec_call_proc, (void*)args);
}