1 files changed, 3 insertions, 1 deletions
diff --git a/vm_core.h b/vm_core.h
index a0b60b5074..f20dfb02f3 100644
--- a/vm_core.h
+++ b/vm_core.h
@@ -347,8 +347,10 @@ typedef struct rb_block_struct {
     VALUE proc;
 } rb_block_t;
 
+extern const rb_data_type_t thread_data_type;
+
 #define GetThreadPtr(obj, ptr) \
-  GetCoreDataFromValue((obj), rb_thread_t, (ptr))
+    TypedData_Get_Struct((obj), rb_thread_t, &thread_data_type, (ptr))
 
 enum rb_thread_status {
     THREAD_TO_KILL,