diff --git a/src/ckdb.c b/src/ckdb.c
index 30141ca4..b47578ac 100644
--- a/src/ckdb.c
+++ b/src/ckdb.c
@@ -1204,8 +1204,8 @@ static void alloc_storage()
 	shares_root = new_ktree(NULL, cmp_shares, shares_free);
 	shares_early_root = new_ktree("SharesEarly", cmp_shares, shares_free);
 	shares_hi_store = k_new_store(shares_free);
-	shares_hi_root = new_ktree("SharesHi", cmp_shares, shares_free);
-	shares_db_root = new_ktree("SharesDB", cmp_shares, shares_free);
+	shares_hi_root = new_ktree("SharesHi", cmp_shares_db, shares_free);
+	shares_db_root = new_ktree("SharesDB", cmp_shares_db, shares_free);
 
 	shareerrors_free = k_new_list("ShareErrors", sizeof(SHAREERRORS),
 					ALLOC_SHAREERRORS, LIMIT_SHAREERRORS,
diff --git a/src/ckdb.h b/src/ckdb.h
index f19b174a..031f79d5 100644
--- a/src/ckdb.h
+++ b/src/ckdb.h
@@ -51,7 +51,7 @@
 
 #define DB_VLOCK "1"
 #define DB_VERSION "1.0.5"
-#define CKDB_VERSION DB_VERSION"-1.984"
+#define CKDB_VERSION DB_VERSION"-1.985"
 
 #define WHERE_FFL " - from %s %s() line %d"
 #define WHERE_FFL_HERE __FILE__, __func__, __LINE__
@@ -2814,6 +2814,7 @@ extern bool workinfo_age(int64_t workinfoid, char *poolinstance, char *by,
 extern double coinbase_reward(int32_t height);
 extern double workinfo_pps(K_ITEM *w_item, int64_t workinfoid);
 extern cmp_t cmp_shares(K_ITEM *a, K_ITEM *b);
+extern cmp_t cmp_shares_db(K_ITEM *a, K_ITEM *b);
 extern cmp_t cmp_shareerrors(K_ITEM *a, K_ITEM *b);
 extern void dsp_sharesummary(K_ITEM *item, FILE *stream);
 extern cmp_t cmp_sharesummary(K_ITEM *a, K_ITEM *b);
diff --git a/src/ckdb_data.c b/src/ckdb_data.c
index c8e8b3c9..77cdca55 100644
--- a/src/ckdb_data.c
+++ b/src/ckdb_data.c
@@ -2333,6 +2333,38 @@ cmp_t cmp_shares(K_ITEM *a, K_ITEM *b)
 	return c;
 }
 
+/* order by workinfoid asc,userid asc,workername asc,enonce1 asc,nonce2 asc,
+ *	nonce asc,expirydate desc
+ * i.e. match the DB table index so duplicates are ignored and all new shares_db
+ *	can always go in the DB */
+cmp_t cmp_shares_db(K_ITEM *a, K_ITEM *b)
+{
+	SHARES *sa, *sb;
+	DATA_SHARES(sa, a);
+	DATA_SHARES(sb, b);
+	cmp_t c = CMP_BIGINT(sa->workinfoid, sb->workinfoid);
+	if (c == 0) {
+		c = CMP_BIGINT(sa->userid, sb->userid);
+		if (c == 0) {
+			c = CMP_STR(sa->workername, sb->workername);
+			if (c == 0) {
+				c = CMP_STR(sa->enonce1, sb->enonce1);
+				if (c == 0) {
+					c = CMP_STR(sa->nonce2, sb->nonce2);
+					if (c == 0) {
+						c = CMP_STR(sa->nonce, sb->nonce);
+						if (c == 0) {
+							c = CMP_TV(sb->expirydate,
+								   sa->expirydate);
+						}
+					}
+				}
+			}
+		}
+	}
+	return c;
+}
+
 // order by workinfoid asc,userid asc,createdate asc,nonce asc,expirydate desc
 cmp_t cmp_shareerrors(K_ITEM *a, K_ITEM *b)
 {
diff --git a/src/ckdb_dbio.c b/src/ckdb_dbio.c
index 8d707403..c7747561 100644
--- a/src/ckdb_dbio.c
+++ b/src/ckdb_dbio.c
@@ -3625,7 +3625,7 @@ discard:
 static void shareerrors_process_early(PGconn *conn, int64_t good_wid,
 				      tv_t *good_cd, K_TREE *trf_root);
 
-// DB Shares are stored by by the summariser to ensure the reload is correct
+// DB Shares are stored by the summariser to ensure the reload is correct
 bool shares_add(PGconn *conn, char *workinfoid, char *username, char *workername,
 		char *clientid, char *errn, char *enonce1, char *nonce2,
 		char *nonce, char *diff, char *sdiff, char *secondaryuserid,
@@ -3640,7 +3640,6 @@ bool shares_add(PGconn *conn, char *workinfoid, char *username, char *workername
 	USERS *users;
 	bool ok = false;
 	char *st = NULL;
-	int errn_int;
 
 	LOGDEBUG("%s(): %s/%s/%s/%s/%ld,%ld",
 		 __func__,
@@ -3649,13 +3648,10 @@ bool shares_add(PGconn *conn, char *workinfoid, char *username, char *workername
 	FREENULL(st);
 
 	TXT_TO_DOUBLE("sdiff", sdiff, sdiff_amt);
-	TXT_TO_INT("errn", errn, errn_int);
 
 	K_WLOCK(shares_free);
 	s_item = k_unlink_head(shares_free);
-	// Don't store duplicates since they will already exist
-	if (errn_int != SE_DUPE && share_min_sdiff > 0 &&
-	    sdiff_amt >= share_min_sdiff)
+	if (share_min_sdiff > 0 && sdiff_amt >= share_min_sdiff)
 		s2_item = k_unlink_head(shares_free);
 	K_WUNLOCK(shares_free);
 
@@ -3731,7 +3727,9 @@ bool shares_add(PGconn *conn, char *workinfoid, char *username, char *workername
 		add_to_ktree(shares_early_root, s_item);
 		k_add_head(shares_early_store, s_item);
 		if (s2_item) {
-			// Just ignore duplicates
+			/* Just ignore duplicates - this matches the DB index
+			   N.B. a duplicate share doesn't have to be SE_DUPE,
+				two shares can be SE_NONE and SE_STALE */
 			tmp_item = find_in_ktree(shares_db_root, s2_item, ctx);
 			if (tmp_item == NULL) {
 				// Store them in advance - always