diff --git a/libc/bionic/pthread_setname_np.cpp b/libc/bionic/pthread_setname_np.cpp
index 1ddf810..7b2fa6b 100644
--- a/libc/bionic/pthread_setname_np.cpp
+++ b/libc/bionic/pthread_setname_np.cpp
@@ -67,7 +67,7 @@
   }
   char comm_name[sizeof(TASK_COMM_FMT) + 8];
   snprintf(comm_name, sizeof(comm_name), TASK_COMM_FMT, tid);
-  int fd = open(comm_name, O_WRONLY);
+  int fd = open(comm_name, O_CLOEXEC | O_WRONLY);
   if (fd == -1) {
     return errno;
   }