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-rw-r--r--thread_pthread.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/thread_pthread.c b/thread_pthread.c
index 6bcb18d89b..f5eebf5b58 100644
--- a/thread_pthread.c
+++ b/thread_pthread.c
@@ -1622,7 +1622,7 @@ native_set_another_thread_name(rb_nativethread_id_t thread_id, VALUE name)
char buf[thread_name_max];
const char *s = "";
# if !defined SET_ANOTHER_THREAD_NAME
- if (pthread_equal(pthread_self(), thread_id)) return;
+ if (!pthread_equal(pthread_self(), thread_id)) return;
# endif
if (!NIL_P(name)) {
long n;