diff --git a/block/qcow2-cache.c b/block/qcow2-cache.c
index 03b3e03c6c..8d0b65e671 100644
--- a/block/qcow2-cache.c
+++ b/block/qcow2-cache.c
@@ -441,7 +441,7 @@ void *qcow2_cache_is_table_offset(BlockDriverState *bs, Qcow2Cache *c,
     return NULL;
 }
 
-void qcow2_cache_discard(BlockDriverState *bs, Qcow2Cache *c, void *table)
+void qcow2_cache_discard(Qcow2Cache *c, void *table)
 {
     int i = qcow2_cache_get_table_idx(c, table);
 
diff --git a/block/qcow2-refcount.c b/block/qcow2-refcount.c
index 65af05dd23..361b39d5cc 100644
--- a/block/qcow2-refcount.c
+++ b/block/qcow2-refcount.c
@@ -875,12 +875,12 @@ static int QEMU_WARN_UNUSED_RESULT update_refcount(BlockDriverState *bs,
                                                 offset);
             if (table != NULL) {
                 qcow2_cache_put(s->refcount_block_cache, &refcount_block);
-                qcow2_cache_discard(bs, s->refcount_block_cache, table);
+                qcow2_cache_discard(s->refcount_block_cache, table);
             }
 
             table = qcow2_cache_is_table_offset(bs, s->l2_table_cache, offset);
             if (table != NULL) {
-                qcow2_cache_discard(bs, s->l2_table_cache, table);
+                qcow2_cache_discard(s->l2_table_cache, table);
             }
 
             if (s->discard_passthrough[type]) {
@@ -3190,7 +3190,7 @@ static int qcow2_discard_refcount_block(BlockDriverState *bs,
                                            discard_block_offs);
     if (refblock) {
         /* discard refblock from the cache if refblock is cached */
-        qcow2_cache_discard(bs, s->refcount_block_cache, refblock);
+        qcow2_cache_discard(s->refcount_block_cache, refblock);
     }
     update_refcount_discard(bs, discard_block_offs, s->cluster_size);
 
diff --git a/block/qcow2.h b/block/qcow2.h
index 867f2e8828..7296784353 100644
--- a/block/qcow2.h
+++ b/block/qcow2.h
@@ -656,7 +656,7 @@ int qcow2_cache_get_empty(BlockDriverState *bs, Qcow2Cache *c, uint64_t offset,
 void qcow2_cache_put(Qcow2Cache *c, void **table);
 void *qcow2_cache_is_table_offset(BlockDriverState *bs, Qcow2Cache *c,
                                   uint64_t offset);
-void qcow2_cache_discard(BlockDriverState *bs, Qcow2Cache *c, void *table);
+void qcow2_cache_discard(Qcow2Cache *c, void *table);
 
 /* qcow2-bitmap.c functions */
 int qcow2_check_bitmaps_refcounts(BlockDriverState *bs, BdrvCheckResult *res,