diff --git a/libraries/liblmdb/CHANGES b/libraries/liblmdb/CHANGES
index a61798765b..95bf833c76 100644
--- a/libraries/liblmdb/CHANGES
+++ b/libraries/liblmdb/CHANGES
@@ -1,5 +1,16 @@
 LMDB 0.9 Change Log
 
+LMDB 0.9.11 Release (2014/01/15)
+	Add mdb_env_set_assert() (ITS#7775)
+	Fix: invalidate txn on page allocation errors (ITS#7377)
+	Fix xcursor tracking in mdb_cursor_del0() (ITS#7771)
+	Fix corruption from deletes (ITS#7756)
+	Fix Windows/MSVC build issues
+	Raise safe limit of max MDB_MAXKEYSIZE
+	Misc code cleanup
+	Documentation
+		Remove spurious note about non-overlapping flags (ITS#7665)
+
 LMDB 0.9.10 Release (2013/11/12)
 	Add MDB_NOMEMINIT option
 	Fix mdb_page_split() again (ITS#7589)
diff --git a/libraries/liblmdb/mdb.c b/libraries/liblmdb/mdb.c
index b6e2f842c7..7e2905891e 100644
--- a/libraries/liblmdb/mdb.c
+++ b/libraries/liblmdb/mdb.c
@@ -3556,7 +3556,7 @@ mdb_env_open2(MDB_env *env)
 			env->me_mapsize = minsize;
 	}
 
-	rc = mdb_env_map(env, meta.mm_address, newenv);
+	rc = mdb_env_map(env, meta.mm_address, newenv || env->me_mapsize != meta.mm_mapsize);
 	if (rc)
 		return rc;
 
@@ -5912,7 +5912,7 @@ more:
 			 * it.  mp: new (sub-)page.  offset: growth in page
 			 * size.  xdata: node data with new page or DB.
 			 */
-			ssize_t		i, offset = 0;
+			unsigned	i, offset = 0;
 			mp = fp = xdata.mv_data = env->me_pbuf;
 			mp->mp_pgno = mc->mc_pg[mc->mc_top]->mp_pgno;
 
@@ -5968,17 +5968,17 @@ more:
 				fp = olddata.mv_data;
 				switch (flags) {
 				default:
-					i = -(ssize_t)SIZELEFT(fp);
 					if (!(mc->mc_db->md_flags & MDB_DUPFIXED)) {
-						offset = i += (ssize_t) EVEN(
-							sizeof(indx_t) + NODESIZE + data->mv_size);
-					} else {
-						i += offset = fp->mp_pad;
-						offset *= 4; /* space for 4 more */
-					}
-					if (i > 0)
+						offset = EVEN(NODESIZE + sizeof(indx_t) +
+							data->mv_size);
 						break;
-					/* FALLTHRU: Sub-page is big enough */
+					}
+					offset = fp->mp_pad;
+					if (SIZELEFT(fp) < offset) {
+						offset *= 4; /* space for 4 more */
+						break;
+					}
+					/* FALLTHRU: Big enough MDB_DUPFIXED sub-page */
 				case MDB_CURRENT:
 					fp->mp_flags |= P_DIRTY;
 					COPY_PGNO(fp->mp_pgno, mp->mp_pgno);
@@ -6027,7 +6027,7 @@ prep_subDB:
 				} else {
 					memcpy((char *)mp + mp->mp_upper, (char *)fp + fp->mp_upper,
 						olddata.mv_size - fp->mp_upper);
-					for (i = NUMKEYS(fp); --i >= 0; )
+					for (i=0; i<NUMKEYS(fp); i++)
 						mp->mp_ptrs[i] = fp->mp_ptrs[i] + offset;
 				}
 			}