diff --git a/block/file-posix.c b/block/file-posix.c
index 256de1f456..989dfc4586 100644
--- a/block/file-posix.c
+++ b/block/file-posix.c
@@ -2061,6 +2061,27 @@ static int coroutine_fn raw_thread_pool_submit(BlockDriverState *bs,
     return thread_pool_submit_co(pool, func, arg);
 }
 
+/*
+ * Check if all memory in this vector is sector aligned.
+ */
+static bool bdrv_qiov_is_aligned(BlockDriverState *bs, QEMUIOVector *qiov)
+{
+    int i;
+    size_t alignment = bdrv_min_mem_align(bs);
+    IO_CODE();
+
+    for (i = 0; i < qiov->niov; i++) {
+        if ((uintptr_t) qiov->iov[i].iov_base % alignment) {
+            return false;
+        }
+        if (qiov->iov[i].iov_len % alignment) {
+            return false;
+        }
+    }
+
+    return true;
+}
+
 static int coroutine_fn raw_co_prw(BlockDriverState *bs, uint64_t offset,
                                    uint64_t bytes, QEMUIOVector *qiov, int type)
 {
diff --git a/block/io.c b/block/io.c
index 51d8f943a4..c3200bcdff 100644
--- a/block/io.c
+++ b/block/io.c
@@ -3227,27 +3227,6 @@ void *qemu_try_blockalign0(BlockDriverState *bs, size_t size)
     return mem;
 }
 
-/*
- * Check if all memory in this vector is sector aligned.
- */
-bool bdrv_qiov_is_aligned(BlockDriverState *bs, QEMUIOVector *qiov)
-{
-    int i;
-    size_t alignment = bdrv_min_mem_align(bs);
-    IO_CODE();
-
-    for (i = 0; i < qiov->niov; i++) {
-        if ((uintptr_t) qiov->iov[i].iov_base % alignment) {
-            return false;
-        }
-        if (qiov->iov[i].iov_len % alignment) {
-            return false;
-        }
-    }
-
-    return true;
-}
-
 void bdrv_io_plug(BlockDriverState *bs)
 {
     BdrvChild *child;
diff --git a/include/block/block-io.h b/include/block/block-io.h
index fd25ffa9be..492f95fc05 100644
--- a/include/block/block-io.h
+++ b/include/block/block-io.h
@@ -150,7 +150,6 @@ void *qemu_blockalign(BlockDriverState *bs, size_t size);
 void *qemu_blockalign0(BlockDriverState *bs, size_t size);
 void *qemu_try_blockalign(BlockDriverState *bs, size_t size);
 void *qemu_try_blockalign0(BlockDriverState *bs, size_t size);
-bool bdrv_qiov_is_aligned(BlockDriverState *bs, QEMUIOVector *qiov);
 
 void bdrv_enable_copy_on_read(BlockDriverState *bs);
 void bdrv_disable_copy_on_read(BlockDriverState *bs);