diff --git a/block/qapi.c b/block/qapi.c
index 6002a76..21edab3 100644
--- a/block/qapi.c
+++ b/block/qapi.c
@@ -493,14 +493,14 @@
     }
 
     bdrv_latency_histogram_stats(&stats->latency_histogram[BLOCK_ACCT_READ],
-                                 &ds->has_x_rd_latency_histogram,
-                                 &ds->x_rd_latency_histogram);
+                                 &ds->has_rd_latency_histogram,
+                                 &ds->rd_latency_histogram);
     bdrv_latency_histogram_stats(&stats->latency_histogram[BLOCK_ACCT_WRITE],
-                                 &ds->has_x_wr_latency_histogram,
-                                 &ds->x_wr_latency_histogram);
+                                 &ds->has_wr_latency_histogram,
+                                 &ds->wr_latency_histogram);
     bdrv_latency_histogram_stats(&stats->latency_histogram[BLOCK_ACCT_FLUSH],
-                                 &ds->has_x_flush_latency_histogram,
-                                 &ds->x_flush_latency_histogram);
+                                 &ds->has_flush_latency_histogram,
+                                 &ds->flush_latency_histogram);
 }
 
 static BlockStats *bdrv_query_bds_stats(BlockDriverState *bs,
diff --git a/blockdev.c b/blockdev.c
index 850fb34..84dd678 100644
--- a/blockdev.c
+++ b/blockdev.c
@@ -4452,7 +4452,7 @@
     aio_context_release(old_context);
 }
 
-void qmp_x_block_latency_histogram_set(
+void qmp_block_latency_histogram_set(
     const char *id,
     bool has_boundaries, uint64List *boundaries,
     bool has_boundaries_read, uint64List *boundaries_read,
diff --git a/qapi/block-core.json b/qapi/block-core.json
index 3f0a5cb..7377fec 100644
--- a/qapi/block-core.json
+++ b/qapi/block-core.json
@@ -537,13 +537,13 @@
 #         +------------------
 #             10   50   100
 #
-# Since: 2.12
+# Since: 4.0
 ##
 { 'struct': 'BlockLatencyHistogramInfo',
   'data': {'boundaries': ['uint64'], 'bins': ['uint64'] } }
 
 ##
-# @x-block-latency-histogram-set:
+# @block-latency-histogram-set:
 #
 # Manage read, write and flush latency histograms for the device.
 #
@@ -573,7 +573,7 @@
 #
 # Returns: error if device is not found or any boundary arrays are invalid.
 #
-# Since: 2.12
+# Since: 4.0
 #
 # Example: set new histograms for all io types with intervals
 # [0, 10), [10, 50), [50, 100), [100, +inf):
@@ -607,7 +607,7 @@
 #      "arguments": { "device": "drive0" } }
 # <- { "return": {} }
 ##
-{ 'command': 'x-block-latency-histogram-set',
+{ 'command': 'block-latency-histogram-set',
   'data': {'id': 'str',
            '*boundaries': ['uint64'],
            '*boundaries-read': ['uint64'],
@@ -894,11 +894,11 @@
 # @timed_stats: Statistics specific to the set of previously defined
 #               intervals of time (Since 2.5)
 #
-# @x_rd_latency_histogram: @BlockLatencyHistogramInfo. (Since 2.12)
+# @rd_latency_histogram: @BlockLatencyHistogramInfo. (Since 4.0)
 #
-# @x_wr_latency_histogram: @BlockLatencyHistogramInfo. (Since 2.12)
+# @wr_latency_histogram: @BlockLatencyHistogramInfo. (Since 4.0)
 #
-# @x_flush_latency_histogram: @BlockLatencyHistogramInfo. (Since 2.12)
+# @flush_latency_histogram: @BlockLatencyHistogramInfo. (Since 4.0)
 #
 # Since: 0.14.0
 ##
@@ -913,9 +913,9 @@
            'invalid_wr_operations': 'int', 'invalid_flush_operations': 'int',
            'account_invalid': 'bool', 'account_failed': 'bool',
            'timed_stats': ['BlockDeviceTimedStats'],
-           '*x_rd_latency_histogram': 'BlockLatencyHistogramInfo',
-           '*x_wr_latency_histogram': 'BlockLatencyHistogramInfo',
-           '*x_flush_latency_histogram': 'BlockLatencyHistogramInfo' } }
+           '*rd_latency_histogram': 'BlockLatencyHistogramInfo',
+           '*wr_latency_histogram': 'BlockLatencyHistogramInfo',
+           '*flush_latency_histogram': 'BlockLatencyHistogramInfo' } }
 
 ##
 # @BlockStats: