diff --git a/CHANGELOG.md b/CHANGELOG.md
index 920930334..46f7144d5 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -135,6 +135,8 @@ The functions `spdk_reactor_enable_framework_monitor_context_switch()` and
 Added spdk_bdev_io_get_nvme_fused_status function for translating bdev_io status to NVMe status
 code for fused compare-and-write operation.
 
+Added spdk_bdev_get_acwu function for getting block device atomic compare and write unit size.
+
 ## v19.10:
 
 ### rpc
diff --git a/include/spdk/bdev.h b/include/spdk/bdev.h
index 1729b9ded..f4d0d42b6 100644
--- a/include/spdk/bdev.h
+++ b/include/spdk/bdev.h
@@ -505,6 +505,14 @@ bool spdk_bdev_has_write_cache(const struct spdk_bdev *bdev);
  */
 const struct spdk_uuid *spdk_bdev_get_uuid(const struct spdk_bdev *bdev);
 
+/**
+ * Get block device atomic compare and write unit.
+ *
+ * \param bdev Block device to query.
+ * \return Atomic compare and write unit for this bdev in blocks.
+ */
+uint16_t spdk_bdev_get_acwu(const struct spdk_bdev *bdev);
+
 /**
  * Get block device metadata size.
  *
diff --git a/lib/bdev/bdev.c b/lib/bdev/bdev.c
index 99bb4e15d..04f686e24 100644
--- a/lib/bdev/bdev.c
+++ b/lib/bdev/bdev.c
@@ -2855,6 +2855,12 @@ spdk_bdev_get_uuid(const struct spdk_bdev *bdev)
 	return &bdev->uuid;
 }
 
+uint16_t
+spdk_bdev_get_acwu(const struct spdk_bdev *bdev)
+{
+	return bdev->acwu;
+}
+
 uint32_t
 spdk_bdev_get_md_size(const struct spdk_bdev *bdev)
 {