diff --git a/bin/pg_repack.c b/bin/pg_repack.c
index 86fac9c..e1c7bda 100644
--- a/bin/pg_repack.c
+++ b/bin/pg_repack.c
@@ -35,13 +35,52 @@ const char *PROGRAM_VERSION = "unknown";
  */
 #define APPLY_COUNT		1000
 
-/* The '1/1, -1/0' lock skipped is from the bgwriter on newly promoted
- * servers. See GH ticket #1.
+
+/* Compile an array of existing transactions which are active during
+ * pg_repack's setup. Some transactions we can safely ignore:
+ *  a. The '1/1, -1/0' lock skipped is from the bgwriter on newly promoted
+ *     servers. See https://github.com/reorg/pg_reorg/issues/1
+ *  b. Our own database connection
+ *  c. Other pg_repack clients, as distinguished by application_name, which
+ *     may be operating on other tables at the same time. See
+ *     https://github.com/reorg/pg_repack/issues/1
+ *
+ * Note, there is some redundancy in how the filtering is done (e.g. excluding
+ * based on pg_backend_pid() and application_name), but that shouldn't hurt
+ * anything.
  */
+#define SQL_XID_SNAPSHOT_90200 \
+	"SELECT repack.array_accum(l.virtualtransaction) " \
+	"  FROM pg_locks AS l " \
+	"  LEFT JOIN pg_stat_activity AS a " \
+	"    ON l.pid = a.pid " \
+	"  WHERE l.locktype = 'virtualxid' AND l.pid <> pg_backend_pid() " \
+	"AND (l.virtualxid, l.virtualtransaction) <> ('1/1', '-1/0') " \
+	"AND (a.application_name IS NULL OR a.application_name <> $1)"
+
+#define SQL_XID_SNAPSHOT_90000 \
+	"SELECT repack.array_accum(l.virtualtransaction) " \
+	"  FROM pg_locks AS l " \
+	"  LEFT JOIN pg_stat_activity AS a " \
+	"    ON l.pid = a.procpid " \
+	"  WHERE l.locktype = 'virtualxid' AND l.pid <> pg_backend_pid() " \
+	"AND (l.virtualxid, l.virtualtransaction) <> ('1/1', '-1/0') " \
+	"AND (a.application_name IS NULL OR a.application_name <> $1)"
+
+/* application_name is not available before 9.0. The last clause of
+ * the WHERE clause is just to eat the $1 parameter (application name).
+ */
+#define SQL_XID_SNAPSHOT_80300 \
+	"SELECT repack.array_accum(virtualtransaction) FROM pg_locks" \
+	" WHERE locktype = 'virtualxid' AND pid <> pg_backend_pid()" \
+	" AND (virtualxid, virtualtransaction) <> ('1/1', '-1/0') " \
+	" AND ($1 IS NOT NULL)"
+
 #define SQL_XID_SNAPSHOT \
-	"SELECT repack.array_accum(virtualtransaction) FROM pg_locks"\
-	" WHERE locktype = 'virtualxid' AND pid <> pg_backend_pid()"\
-	" AND (virtualxid, virtualtransaction) <> ('1/1', '-1/0')"
+	(PQserverVersion(connection) >= 90200 ? SQL_XID_SNAPSHOT_90200 : \
+	 (PQserverVersion(connection) >= 90000 ? SQL_XID_SNAPSHOT_90000 : \
+	  SQL_XID_SNAPSHOT_80300))
+		
 
 #define SQL_XID_ALIVE \
 	"SELECT pid FROM pg_locks WHERE locktype = 'virtualxid'"\
@@ -554,7 +593,8 @@ repack_one_table(const repack_table *table, const char *orderby)
 	command("SELECT set_config('work_mem', current_setting('maintenance_work_mem'), true)", 0, NULL);
 	if (orderby && !orderby[0])
 		command("SET LOCAL synchronize_seqscans = off", 0, NULL);
-	res = execute(SQL_XID_SNAPSHOT, 0, NULL);
+	params[0] = PROGRAM_NAME;
+	res = execute(SQL_XID_SNAPSHOT, 1, params);
 	vxid = strdup(PQgetvalue(res, 0, 0));
 	PQclear(res);