diff --git a/muted-tests.yml b/muted-tests.yml
index 502b9a3ab0634..b57976e2ae3de 100644
--- a/muted-tests.yml
+++ b/muted-tests.yml
@@ -259,9 +259,6 @@ tests:
 - class: org.elasticsearch.smoketest.SmokeTestMonitoringWithSecurityIT
   method: testHTTPExporterWithSSL
   issue: https://github.com/elastic/elasticsearch/issues/122220
-- class: org.elasticsearch.blocks.SimpleBlocksIT
-  method: testConcurrentAddBlock
-  issue: https://github.com/elastic/elasticsearch/issues/122324
 - class: org.elasticsearch.smoketest.DocsClientYamlTestSuiteIT
   method: test {yaml=reference/cat/health/cat-health-example}
   issue: https://github.com/elastic/elasticsearch/issues/122335
diff --git a/server/src/internalClusterTest/java/org/elasticsearch/blocks/SimpleBlocksIT.java b/server/src/internalClusterTest/java/org/elasticsearch/blocks/SimpleBlocksIT.java
index 93f8997ff24a1..b11861833a2ba 100644
--- a/server/src/internalClusterTest/java/org/elasticsearch/blocks/SimpleBlocksIT.java
+++ b/server/src/internalClusterTest/java/org/elasticsearch/blocks/SimpleBlocksIT.java
@@ -405,11 +405,13 @@ public void testConcurrentAddBlock() throws InterruptedException, ExecutionExcep
         try {
             startInParallel(threadCount, i -> {
                 try {
-                    indicesAdmin().prepareAddBlock(block, indexName).get();
+                    assertBusy(() -> assertAcked(indicesAdmin().prepareAddBlock(block, indexName).get()));
                     assertIndexHasBlock(block, indexName);
                 } catch (final ClusterBlockException e) {
                     assertThat(e.blocks(), hasSize(1));
                     assertTrue(e.blocks().stream().allMatch(b -> b.id() == block.getBlock().id()));
+                } catch (Exception e) {
+                    throw new RuntimeException("Unable to ack an index block request", e);
                 }
             });
             assertIndexHasBlock(block, indexName);