diff --git a/vm_core.h b/vm_core.h
index 3104d389b7..bcb0aae7ce 100644
--- a/vm_core.h
+++ b/vm_core.h
@@ -1271,7 +1271,7 @@ static inline int
 vm_block_handler_verify(VALUE block_handler)
 {
     VM_ASSERT(block_handler == VM_BLOCK_HANDLER_NONE ||
-	      (vm_block_handler_type(block_handler), TRUE));
+	      (vm_block_handler_type(block_handler), 1));
     return 1;
 }