1 files changed, 2 insertions, 2 deletions
diff --git a/thread.c b/thread.c
index a5f0e556f1..0a8544fbda 100644
--- a/thread.c
+++ b/thread.c
@@ -321,9 +321,9 @@ rb_thread_s_debug_set(VALUE self, VALUE val)
 #endif
 
 #ifndef fill_thread_id_str
-# define fill_thread_id_string(thid, buf) (void *)(thid)
+# define fill_thread_id_string(thid, buf) ((void *)(uintptr_t)(thid))
 # define fill_thread_id_str(th) (void)0
-# define thread_id_str(th) ((void *)(th)->thread_id)
+# define thread_id_str(th) ((void *)(uintptr_t)(th)->thread_id)
 # define PRI_THREAD_ID "p"
 #endif