1 files changed, 1 insertions, 0 deletions
diff --git a/thread.c b/thread.c
index 7190a943bd..62713e80aa 100644
--- a/thread.c
+++ b/thread.c
@@ -2776,6 +2776,7 @@ rb_thread_setname(VALUE thread, VALUE name)
 {
     rb_thread_t *th;
     GetThreadPtr(thread, th);
+    StringValueCStr(name);
     th->name = rb_str_new_frozen(name);
 #if defined(HAVE_PTHREAD_SETNAME_NP)
 # if defined(__linux__)