diff --git a/core/src/main/java/tech/pegasys/web3signer/core/routes/eth2/CommitBoostPublicKeysRoute.java b/core/src/main/java/tech/pegasys/web3signer/core/routes/eth2/CommitBoostPublicKeysRoute.java
index 261290049..abdc3cb47 100644
--- a/core/src/main/java/tech/pegasys/web3signer/core/routes/eth2/CommitBoostPublicKeysRoute.java
+++ b/core/src/main/java/tech/pegasys/web3signer/core/routes/eth2/CommitBoostPublicKeysRoute.java
@@ -15,6 +15,8 @@
 import tech.pegasys.web3signer.core.Context;
 import tech.pegasys.web3signer.core.routes.Web3SignerRoute;
 import tech.pegasys.web3signer.core.service.http.handlers.commitboost.CommitBoostPublicKeysHandler;
+import tech.pegasys.web3signer.signing.ArtifactSignerProvider;
+import tech.pegasys.web3signer.signing.config.DefaultArtifactSignerProvider;
 
 import io.vertx.core.http.HttpMethod;
 import io.vertx.core.json.JsonObject;
@@ -23,9 +25,16 @@
 public class CommitBoostPublicKeysRoute implements Web3SignerRoute {
   private static final String PATH = "/signer/v1/get_pubkeys";
   private final Context context;
+  private final ArtifactSignerProvider artifactSignerProvider;
 
   public CommitBoostPublicKeysRoute(final Context context) {
     this.context = context;
+    // there should be only one DefaultArtifactSignerProvider in eth2 mode
+    artifactSignerProvider =
+        context.getArtifactSignerProviders().stream()
+            .filter(p -> p instanceof DefaultArtifactSignerProvider)
+            .findFirst()
+            .orElseThrow();
   }
 
   @Override
@@ -36,7 +45,7 @@ public void register() {
         .produces(JSON_HEADER)
         .handler(
             new BlockingHandlerDecorator(
-                new CommitBoostPublicKeysHandler(context.getArtifactSignerProviders()), false))
+                new CommitBoostPublicKeysHandler(artifactSignerProvider), false))
         .failureHandler(context.getErrorHandler())
         .failureHandler(
             ctx -> {
diff --git a/core/src/main/java/tech/pegasys/web3signer/core/service/http/handlers/commitboost/CommitBoostPublicKeysHandler.java b/core/src/main/java/tech/pegasys/web3signer/core/service/http/handlers/commitboost/CommitBoostPublicKeysHandler.java
index 623cb73e3..95820e4d8 100644
--- a/core/src/main/java/tech/pegasys/web3signer/core/service/http/handlers/commitboost/CommitBoostPublicKeysHandler.java
+++ b/core/src/main/java/tech/pegasys/web3signer/core/service/http/handlers/commitboost/CommitBoostPublicKeysHandler.java
@@ -20,9 +20,7 @@
 import tech.pegasys.web3signer.core.service.http.handlers.commitboost.json.PublicKeysResponse;
 import tech.pegasys.web3signer.signing.ArtifactSignerProvider;
 import tech.pegasys.web3signer.signing.KeyType;
-import tech.pegasys.web3signer.signing.config.DefaultArtifactSignerProvider;
 
-import java.util.List;
 import java.util.Map;
 import java.util.Set;
 import java.util.stream.Collectors;
@@ -36,22 +34,15 @@
 
 public class CommitBoostPublicKeysHandler implements Handler<RoutingContext> {
   private static final Logger LOG = LogManager.getLogger();
-  private final List<ArtifactSignerProvider> artifactSignerProviders;
+  private final ArtifactSignerProvider artifactSignerProvider;
   private final ObjectMapper objectMapper = SigningObjectMapperFactory.createObjectMapper();
 
-  public CommitBoostPublicKeysHandler(final List<ArtifactSignerProvider> artifactSignerProviders) {
-    this.artifactSignerProviders = artifactSignerProviders;
+  public CommitBoostPublicKeysHandler(final ArtifactSignerProvider artifactSignerProvider) {
+    this.artifactSignerProvider = artifactSignerProvider;
   }
 
   @Override
   public void handle(final RoutingContext context) {
-    // obtain DefaultArtifactSignerProvider as that is the only one we are dealing in eth2 mode.
-    final ArtifactSignerProvider artifactSignerProvider =
-        artifactSignerProviders.stream()
-            .filter(provider -> provider instanceof DefaultArtifactSignerProvider)
-            .findFirst()
-            .orElseThrow();
-
     final PublicKeysResponse publicKeysResponse = toPublicKeysResponse(artifactSignerProvider);
     try {
       final String jsonEncoded = objectMapper.writeValueAsString(publicKeysResponse);