diff --git a/mdbx.h b/mdbx.h
index 4e0d6b9a..414d6444 100644
--- a/mdbx.h
+++ b/mdbx.h
@@ -1458,7 +1458,7 @@ enum MDBX_txn_flags_t {
   /** Transaction is invalid.
    * \note Transaction state flag. Returned from \ref mdbx_txn_flags()
    * but can't be used with \ref mdbx_txn_begin(). */
-  MDBX_TXN_INVALID = 0x80000000,
+  MDBX_TXN_INVALID = INT32_MIN,
 
   /** Transaction is finished or never began.
    * \note Transaction state flag. Returned from \ref mdbx_txn_flags()
diff --git a/src/internals.h b/src/internals.h
index ce1d6098..13203afe 100644
--- a/src/internals.h
+++ b/src/internals.h
@@ -897,7 +897,7 @@ struct MDBX_txn {
 
 #define TXN_FLAGS                                                              \
   (MDBX_TXN_FINISHED | MDBX_TXN_ERROR | MDBX_TXN_DIRTY | MDBX_TXN_SPILLS |     \
-   MDBX_TXN_HAS_CHILD)
+   MDBX_TXN_HAS_CHILD | MDBX_TXN_INVALID)
 
 #if (TXN_FLAGS & (MDBX_TXN_RW_BEGIN_FLAGS | MDBX_TXN_RO_BEGIN_FLAGS)) ||       \
     ((MDBX_TXN_RW_BEGIN_FLAGS | MDBX_TXN_RO_BEGIN_FLAGS | TXN_FLAGS) &         \