diff --git a/include/haproxy/stick_table.h b/include/haproxy/stick_table.h
index 094c0e81c..2c5e7a223 100644
--- a/include/haproxy/stick_table.h
+++ b/include/haproxy/stick_table.h
@@ -199,7 +199,11 @@ static inline void *stktable_data_ptr_idx(struct stktable *t, struct stksess *ts
  */
 static inline uint stktable_calc_shard_num(const struct stktable *t, const void *key, size_t len)
 {
+#if CONFIG_HAP_TBL_BUCKETS > 1
 	return XXH32(key, len, t->hash_seed) % CONFIG_HAP_TBL_BUCKETS;
+#else
+	return 0;
+#endif
 }
 
 /* kill an entry if it's expired and its ref_cnt is zero */
@@ -227,6 +231,9 @@ static inline void stksess_kill_if_expired(struct stktable *t, struct stksess *t
 
 		shard = stktable_calc_shard_num(t, ts->key.key, len);
 
+		/* make the compiler happy when shard is not used without threads */
+		ALREADY_CHECKED(shard);
+
 		HA_RWLOCK_WRLOCK(STK_TABLE_LOCK, &t->shards[shard].sh_lock);
 		__stksess_kill_if_expired(t, ts);
 		HA_RWLOCK_WRUNLOCK(STK_TABLE_LOCK, &t->shards[shard].sh_lock);
diff --git a/src/stick_table.c b/src/stick_table.c
index 68095260c..a1cc03c0e 100644
--- a/src/stick_table.c
+++ b/src/stick_table.c
@@ -127,6 +127,9 @@ void stksess_free(struct stktable *t, struct stksess *ts)
 
 	shard = stktable_calc_shard_num(t, ts->key.key, len);
 
+	/* make the compiler happy when shard is not used without threads */
+	ALREADY_CHECKED(shard);
+
 	HA_RWLOCK_RDLOCK(STK_TABLE_LOCK, &t->shards[shard].sh_lock);
 	__stksess_free(t, ts);
 	HA_RWLOCK_RDUNLOCK(STK_TABLE_LOCK, &t->shards[shard].sh_lock);
@@ -173,6 +176,9 @@ int stksess_kill(struct stktable *t, struct stksess *ts, int decrefcnt)
 
 	shard = stktable_calc_shard_num(t, ts->key.key, len);
 
+	/* make the compiler happy when shard is not used without threads */
+	ALREADY_CHECKED(shard);
+
 	HA_RWLOCK_WRLOCK(STK_TABLE_LOCK, &t->shards[shard].sh_lock);
 	ret = __stksess_kill(t, ts);
 	HA_RWLOCK_WRUNLOCK(STK_TABLE_LOCK, &t->shards[shard].sh_lock);