diff --git a/src/core.c b/src/core.c
index e61c0ebb..a94f9e24 100644
--- a/src/core.c
+++ b/src/core.c
@@ -16899,7 +16899,7 @@ static __inline int mdbx_couple_init(MDBX_cursor_couple *couple,
   couple->outer.mc_pg[0] = 0;
   couple->outer.mc_flags = 0;
   STATIC_ASSERT(CC_BRANCH == P_BRANCH && CC_LEAF == P_LEAF &&
-                CC_LEAF2 == P_LEAF2);
+                CC_OVERFLOW == P_OVERFLOW && CC_LEAF2 == P_LEAF2);
   couple->outer.mc_checking =
       (mdbx_audit_enabled() || (txn->mt_env->me_flags & MDBX_VALIDATION))
           ? CC_PAGECHECK | CC_LEAF
diff --git a/src/internals.h b/src/internals.h
index 4162610d..325a0524 100644
--- a/src/internals.h
+++ b/src/internals.h
@@ -1050,7 +1050,8 @@ struct MDBX_cursor {
   /* Cursor checking flags. */
 #define CC_BRANCH 0x01    /* same as P_BRANCH for CHECK_LEAF_TYPE() */
 #define CC_LEAF 0x02      /* same as P_LEAF for CHECK_LEAF_TYPE() */
-#define CC_UPDATING 0x04  /* update/rebalance pending */
+#define CC_OVERFLOW 0x04  /* same as P_OVERFLOW for CHECK_LEAF_TYPE() */
+#define CC_UPDATING 0x08  /* update/rebalance pending */
 #define CC_SKIPORD 0x10   /* don't check keys ordering */
 #define CC_LEAF2 0x20     /* same as P_LEAF2 for CHECK_LEAF_TYPE() */
 #define CC_RETIRING 0x40  /* refs to child pages may be invalid */
@@ -1063,7 +1064,7 @@ struct MDBX_cursor {
 
 #define CHECK_LEAF_TYPE(mc, mp)                                                \
   (((PAGETYPE_EXTRA(mp) ^ (mc)->mc_checking) &                                 \
-    (CC_BRANCH | CC_LEAF | CC_LEAF2)) == 0)
+    (CC_BRANCH | CC_LEAF | CC_OVERFLOW | CC_LEAF2)) == 0)
 
 /* Context for sorted-dup records.
  * We could have gone to a fully recursive design, with arbitrarily