diff --git a/buildheader/db.h_4_1 b/buildheader/db.h_4_1
index 19de1cc9b6c..21d37492147 100644
--- a/buildheader/db.h_4_1
+++ b/buildheader/db.h_4_1
@@ -219,8 +219,9 @@ struct __toku_db_txn_active {
 };
 struct __toku_db_txn {
   DB_ENV *mgrp /*In TokuDB, mgrp is a DB_ENV not a DB_TXNMGR*/; /* 32-bit offset=0 size=4, 64=bit offset=0 size=8 */
+  DB_TXN *parent; /* 32-bit offset=4 size=4, 64=bit offset=8 size=8 */
   struct __toku_db_txn_internal *i;
-  void* __toku_dummy0[9];
+  void* __toku_dummy0[8];
   char __toku_dummy1[24];
   void *api_internal; /* 32-bit offset=68 size=4, 64=bit offset=112 size=8 */
   void* __toku_dummy2[1];
diff --git a/buildheader/db.h_4_3 b/buildheader/db.h_4_3
index 5fb3822264a..abccd79b6c9 100644
--- a/buildheader/db.h_4_3
+++ b/buildheader/db.h_4_3
@@ -235,8 +235,9 @@ struct __toku_db_txn_active {
 };
 struct __toku_db_txn {
   DB_ENV *mgrp /*In TokuDB, mgrp is a DB_ENV not a DB_TXNMGR*/; /* 32-bit offset=0 size=4, 64=bit offset=0 size=8 */
+  DB_TXN *parent; /* 32-bit offset=4 size=4, 64=bit offset=8 size=8 */
   struct __toku_db_txn_internal *i;
-  void* __toku_dummy0[14];
+  void* __toku_dummy0[13];
   char __toku_dummy1[24];
   void *api_internal; /* 32-bit offset=88 size=4, 64=bit offset=152 size=8 */
   void* __toku_dummy2[2];
diff --git a/buildheader/db.h_4_4 b/buildheader/db.h_4_4
index 42798ed7402..941913ee01c 100644
--- a/buildheader/db.h_4_4
+++ b/buildheader/db.h_4_4
@@ -240,8 +240,9 @@ struct __toku_db_txn_active {
 };
 struct __toku_db_txn {
   DB_ENV *mgrp /*In TokuDB, mgrp is a DB_ENV not a DB_TXNMGR*/; /* 32-bit offset=0 size=4, 64=bit offset=0 size=8 */
+  DB_TXN *parent; /* 32-bit offset=4 size=4, 64=bit offset=8 size=8 */
   struct __toku_db_txn_internal *i;
-  void* __toku_dummy0[17];
+  void* __toku_dummy0[16];
   char __toku_dummy1[8];
   void *api_internal; /* 32-bit offset=84 size=4, 64=bit offset=160 size=8 */
   void* __toku_dummy2[2];
diff --git a/buildheader/db.h_4_5 b/buildheader/db.h_4_5
index ae3ebd05fc1..6ba875231fb 100644
--- a/buildheader/db.h_4_5
+++ b/buildheader/db.h_4_5
@@ -239,8 +239,9 @@ struct __toku_db_txn_active {
 };
 struct __toku_db_txn {
   DB_ENV *mgrp /*In TokuDB, mgrp is a DB_ENV not a DB_TXNMGR*/; /* 32-bit offset=0 size=4, 64=bit offset=0 size=8 */
+  DB_TXN *parent; /* 32-bit offset=4 size=4, 64=bit offset=8 size=8 */
   struct __toku_db_txn_internal *i;
-  void* __toku_dummy0[17];
+  void* __toku_dummy0[16];
   char __toku_dummy1[8];
   void *api_internal; /* 32-bit offset=84 size=4, 64=bit offset=160 size=8 */
   void* __toku_dummy2[2];
diff --git a/buildheader/db.h_4_6 b/buildheader/db.h_4_6
index 407625c5454..8d72002249a 100644
--- a/buildheader/db.h_4_6
+++ b/buildheader/db.h_4_6
@@ -243,8 +243,9 @@ struct __toku_db_txn_active {
 };
 struct __toku_db_txn {
   DB_ENV *mgrp /*In TokuDB, mgrp is a DB_ENV not a DB_TXNMGR*/; /* 32-bit offset=0 size=4, 64=bit offset=0 size=8 */
+  DB_TXN *parent; /* 32-bit offset=4 size=4, 64=bit offset=8 size=8 */
   struct __toku_db_txn_internal *i;
-  void* __toku_dummy0[18];
+  void* __toku_dummy0[17];
   char __toku_dummy1[8];
   void *api_internal; /* 32-bit offset=88 size=4, 64=bit offset=168 size=8 */
   void* __toku_dummy2[2];
diff --git a/buildheader/sample_offsets_64_4_1.h b/buildheader/sample_offsets_64_4_1.h
index 585785c46ac..019edfd2154 100644
--- a/buildheader/sample_offsets_64_4_1.h
+++ b/buildheader/sample_offsets_64_4_1.h
@@ -76,6 +76,7 @@ struct fieldinfo db_txn_active_fields64[] = {
 };
 struct fieldinfo db_txn_fields64[] = {
   {"DB_ENV *mgrp /*In TokuDB, mgrp is a DB_ENV not a DB_TXNMGR*/", 0, 8},
+  {"DB_TXN *parent", 8, 8},
   {"void *api_internal", 112, 8},
   {"int (*abort) (DB_TXN *)", 128, 8},
   {"int (*commit) (DB_TXN*, u_int32_t)", 136, 8},
diff --git a/buildheader/sample_offsets_64_4_3.h b/buildheader/sample_offsets_64_4_3.h
index e0145048c17..b09792c6063 100644
--- a/buildheader/sample_offsets_64_4_3.h
+++ b/buildheader/sample_offsets_64_4_3.h
@@ -82,6 +82,7 @@ struct fieldinfo db_txn_active_fields64[] = {
 };
 struct fieldinfo db_txn_fields64[] = {
   {"DB_ENV *mgrp /*In TokuDB, mgrp is a DB_ENV not a DB_TXNMGR*/", 0, 8},
+  {"DB_TXN *parent", 8, 8},
   {"void *api_internal", 152, 8},
   {"int (*abort) (DB_TXN *)", 176, 8},
   {"int (*commit) (DB_TXN*, u_int32_t)", 184, 8},
diff --git a/buildheader/sample_offsets_64_4_4.h b/buildheader/sample_offsets_64_4_4.h
index 19de154d154..1eb5236f4f1 100644
--- a/buildheader/sample_offsets_64_4_4.h
+++ b/buildheader/sample_offsets_64_4_4.h
@@ -82,6 +82,7 @@ struct fieldinfo db_txn_active_fields64[] = {
 };
 struct fieldinfo db_txn_fields64[] = {
   {"DB_ENV *mgrp /*In TokuDB, mgrp is a DB_ENV not a DB_TXNMGR*/", 0, 8},
+  {"DB_TXN *parent", 8, 8},
   {"void *api_internal", 160, 8},
   {"int (*abort) (DB_TXN *)", 184, 8},
   {"int (*commit) (DB_TXN*, u_int32_t)", 192, 8},
diff --git a/buildheader/sample_offsets_64_4_5.h b/buildheader/sample_offsets_64_4_5.h
index 4a30a1bf1a6..c757c4bb236 100644
--- a/buildheader/sample_offsets_64_4_5.h
+++ b/buildheader/sample_offsets_64_4_5.h
@@ -81,6 +81,7 @@ struct fieldinfo db_txn_active_fields64[] = {
 };
 struct fieldinfo db_txn_fields64[] = {
   {"DB_ENV *mgrp /*In TokuDB, mgrp is a DB_ENV not a DB_TXNMGR*/", 0, 8},
+  {"DB_TXN *parent", 8, 8},
   {"void *api_internal", 160, 8},
   {"int (*abort) (DB_TXN *)", 184, 8},
   {"int (*commit) (DB_TXN*, u_int32_t)", 192, 8},
diff --git a/buildheader/sample_offsets_64_4_6.h b/buildheader/sample_offsets_64_4_6.h
index aa781c23197..99de9241ea9 100644
--- a/buildheader/sample_offsets_64_4_6.h
+++ b/buildheader/sample_offsets_64_4_6.h
@@ -81,6 +81,7 @@ struct fieldinfo db_txn_active_fields64[] = {
 };
 struct fieldinfo db_txn_fields64[] = {
   {"DB_ENV *mgrp /*In TokuDB, mgrp is a DB_ENV not a DB_TXNMGR*/", 0, 8},
+  {"DB_TXN *parent", 8, 8},
   {"void *api_internal", 168, 8},
   {"int (*abort) (DB_TXN *)", 192, 8},
   {"int (*commit) (DB_TXN*, u_int32_t)", 200, 8},
diff --git a/include/db.h b/include/db.h
index 42798ed7402..941913ee01c 100644
--- a/include/db.h
+++ b/include/db.h
@@ -240,8 +240,9 @@ struct __toku_db_txn_active {
 };
 struct __toku_db_txn {
   DB_ENV *mgrp /*In TokuDB, mgrp is a DB_ENV not a DB_TXNMGR*/; /* 32-bit offset=0 size=4, 64=bit offset=0 size=8 */
+  DB_TXN *parent; /* 32-bit offset=4 size=4, 64=bit offset=8 size=8 */
   struct __toku_db_txn_internal *i;
-  void* __toku_dummy0[17];
+  void* __toku_dummy0[16];
   char __toku_dummy1[8];
   void *api_internal; /* 32-bit offset=84 size=4, 64=bit offset=160 size=8 */
   void* __toku_dummy2[2];