1 files changed, 1 insertions, 0 deletions
diff --git a/ruby.h b/ruby.h
index f47aca0758..94e13d4fcb 100644
--- a/ruby.h
+++ b/ruby.h
@@ -162,6 +162,7 @@ VALUE rb_uint2inum _((unsigned long));
 #define T_MATCH  0x23
 #define T_SYMBOL 0x24
 
+#define T_BLKTAG 0x3b
 #define T_UNDEF  0x3c
 #define T_VARMAP 0x3d
 #define T_SCOPE  0x3e