diff --git a/test/test-clusters/src/main/java/org/elasticsearch/test/cluster/FeatureFlag.java b/test/test-clusters/src/main/java/org/elasticsearch/test/cluster/FeatureFlag.java
index e173aadd662cc..88b6ad6346f30 100644
--- a/test/test-clusters/src/main/java/org/elasticsearch/test/cluster/FeatureFlag.java
+++ b/test/test-clusters/src/main/java/org/elasticsearch/test/cluster/FeatureFlag.java
@@ -16,7 +16,7 @@
  */
 public enum FeatureFlag {
     TIME_SERIES_MODE("es.index_mode_feature_flag_registered=true", Version.fromString("8.0.0"), null),
-    INFERENCE_RESCORER("es.inference_rescorer_feature_flag_enabled", Version.fromString("8.10.0"), null),
+    INFERENCE_RESCORER("es.inference_rescorer_feature_flag_enabled=true", Version.fromString("8.10.0"), null),
     DATA_STREAM_LIFECYCLE_ENABLED("es.dlm_feature_flag_enabled=true", Version.fromString("8.8.0"), null);
 
     public final String systemProperty;