diff --git a/libraries/liblmdb/mdb.c b/libraries/liblmdb/mdb.c
index 5cd4536..819a631 100644
--- a/libraries/liblmdb/mdb.c
+++ b/libraries/liblmdb/mdb.c
@@ -7842,6 +7842,9 @@ mdb_page_merge(MDB_cursor *csrc, MDB_cursor *cdst)
 				m3->mc_pg[top] = pdst;
 				m3->mc_ki[top] += nkeys;
 				m3->mc_ki[top-1] = cdst->mc_ki[top-1];
+			} else if (m3->mc_pg[top-1] == csrc->mc_pg[top-1] &&
+				m3->mc_ki[top-1] > csrc->mc_ki[top-1]) {
+				m3->mc_ki[top-1]--;
 			}
 		}
 	}