diff --git a/src/main/java/org/prebid/server/validation/BidderParamValidator.java b/src/main/java/org/prebid/server/validation/BidderParamValidator.java
index 98dea900d5c..71a21b13341 100644
--- a/src/main/java/org/prebid/server/validation/BidderParamValidator.java
+++ b/src/main/java/org/prebid/server/validation/BidderParamValidator.java
@@ -7,7 +7,6 @@
 import com.networknt.schema.SpecVersion;
 import com.networknt.schema.ValidationMessage;
 import org.apache.commons.collections4.map.CaseInsensitiveMap;
-import org.apache.commons.lang3.ObjectUtils;
 import org.apache.commons.lang3.StringUtils;
 import org.prebid.server.bidder.BidderCatalog;
 import org.prebid.server.json.EncodeException;
@@ -88,7 +87,7 @@ public static BidderParamValidator create(BidderCatalog bidderCatalog,
         final Map<String, JsonNode> bidderRawSchemas = new LinkedHashMap<>();
 
         bidderCatalog.names().forEach(bidder -> bidderRawSchemas.put(
-                bidder, createSchemaNode(schemaDirectory, maybeResolveAlias(bidderCatalog, bidder), mapper)));
+                bidder, createSchemaNode(bidderCatalog, schemaDirectory, bidder, mapper)));
 
         return new BidderParamValidator(toBidderSchemas(bidderRawSchemas), toSchemas(bidderRawSchemas, mapper));
     }
@@ -120,8 +119,20 @@ private static JsonSchema toBidderSchema(JsonNode schema, String bidder) {
         return result;
     }
 
-    private static String maybeResolveAlias(BidderCatalog bidderCatalog, String bidder) {
-        return ObjectUtils.defaultIfNull(bidderCatalog.bidderInfoByName(bidder).getAliasOf(), bidder);
+    private static JsonNode createSchemaNode(BidderCatalog bidderCatalog,
+                                             String schemaDirectory,
+                                             String bidder,
+                                             JacksonMapper mapper) {
+
+        try {
+            return createSchemaNode(schemaDirectory, bidder, mapper);
+        } catch (IllegalArgumentException e) {
+            final String parentBidder = bidderCatalog.bidderInfoByName(bidder).getAliasOf();
+            if (parentBidder != null) {
+                return createSchemaNode(schemaDirectory, parentBidder, mapper);
+            }
+            throw e;
+        }
     }
 
     private static JsonNode createSchemaNode(String schemaDirectory, String bidder, JacksonMapper mapper) {
diff --git a/src/test/java/org/prebid/server/bidder/adtrgtme/AdtrgtmeBidderTest.java b/src/test/java/org/prebid/server/bidder/adtrgtme/AdtrgtmeBidderTest.java
index af2b0674f7b..55ae12b0c37 100644
--- a/src/test/java/org/prebid/server/bidder/adtrgtme/AdtrgtmeBidderTest.java
+++ b/src/test/java/org/prebid/server/bidder/adtrgtme/AdtrgtmeBidderTest.java
@@ -21,7 +21,6 @@
 import org.prebid.server.bidder.model.HttpResponse;
 import org.prebid.server.bidder.model.Result;
 import org.prebid.server.proto.openrtb.ext.ExtPrebid;
-import org.prebid.server.proto.openrtb.ext.request.adrino.ExtImpAdrino;
 import org.prebid.server.proto.openrtb.ext.request.adtrgtme.ExtImpAdtrgtme;
 import org.prebid.server.util.HttpUtil;
 
@@ -129,9 +128,9 @@ public void makeHttpRequestsShouldSplitRequestIntoMultipleRequests() {
         // given
         final BidRequest bidRequest = BidRequest.builder().site(Site.builder().id("site_id").build())
                 .imp(asList(givenImp(impBuilder -> impBuilder.xNative(Native.builder().build())
-                                .ext(mapper.valueToTree(ExtPrebid.of(null, ExtImpAdrino.of("test"))))),
+                                .ext(mapper.valueToTree(ExtPrebid.of(null, ExtImpAdtrgtme.of(1))))),
                         givenImp(impBuilder -> impBuilder.xNative(Native.builder().build())
-                                .ext(mapper.valueToTree(ExtPrebid.of(null, ExtImpAdrino.of("test"))))))).build();
+                                .ext(mapper.valueToTree(ExtPrebid.of(null, ExtImpAdtrgtme.of(1))))))).build();
 
         // when
         final Result<List<HttpRequest<BidRequest>>> result = target.makeHttpRequests(bidRequest);
diff --git a/src/test/java/org/prebid/server/it/ApplicationTest.java b/src/test/java/org/prebid/server/it/ApplicationTest.java
index 16c7a550c52..ca4414b8897 100644
--- a/src/test/java/org/prebid/server/it/ApplicationTest.java
+++ b/src/test/java/org/prebid/server/it/ApplicationTest.java
@@ -451,7 +451,7 @@ public void biddersParamsShouldReturnBidderSchemas() throws JSONException, IOExc
         final Map<String, JsonNode> expectedMap = CollectionUtils.union(bidders, aliases.keySet()).stream()
                 .collect(Collectors.toMap(
                         Function.identity(),
-                        bidderName -> jsonSchemaToJsonNode(aliases.getOrDefault(bidderName, bidderName))));
+                        bidderName -> jsonSchemaToJsonNode(bidderName, aliases)));
 
         assertThat(responseAsMap.keySet()).hasSameElementsAs(expectedMap.keySet());
         assertThat(responseAsMap).containsAllEntriesOf(expectedMap);
@@ -693,6 +693,14 @@ private static Map<String, String> getBidderAliasesFromConfigFiles() throws IOEx
         return Collections.emptyMap();
     }
 
+    private static JsonNode jsonSchemaToJsonNode(String bidderName, Map<String, String> aliases) {
+        try {
+            return jsonSchemaToJsonNode(bidderName);
+        } catch (IllegalArgumentException e) {
+            return jsonSchemaToJsonNode(aliases.getOrDefault(bidderName, bidderName));
+        }
+    }
+
     private static JsonNode jsonSchemaToJsonNode(String bidderName) {
         final String path = "static/bidder-params/" + bidderName + ".json";
         try {
diff --git a/src/test/java/org/prebid/server/validation/BidderParamValidatorTest.java b/src/test/java/org/prebid/server/validation/BidderParamValidatorTest.java
index 674c4026a72..c0b99d22f38 100644
--- a/src/test/java/org/prebid/server/validation/BidderParamValidatorTest.java
+++ b/src/test/java/org/prebid/server/validation/BidderParamValidatorTest.java
@@ -9,6 +9,7 @@
 import org.prebid.server.VertxTest;
 import org.prebid.server.bidder.BidderCatalog;
 import org.prebid.server.bidder.BidderInfo;
+import org.prebid.server.proto.openrtb.ext.request.adrino.ExtImpAdrino;
 import org.prebid.server.proto.openrtb.ext.request.adtelligent.ExtImpAdtelligent;
 import org.prebid.server.proto.openrtb.ext.request.appnexus.ExtImpAppnexus;
 import org.prebid.server.proto.openrtb.ext.request.audiencenetwork.ExtImpAudienceNetwork;
@@ -33,6 +34,7 @@
 import static org.mockito.ArgumentMatchers.anyString;
 import static org.mockito.ArgumentMatchers.eq;
 import static org.mockito.BDDMockito.given;
+import static org.mockito.Mock.Strictness.LENIENT;
 
 @ExtendWith(MockitoExtension.class)
 public class BidderParamValidatorTest extends VertxTest {
@@ -47,8 +49,9 @@ public class BidderParamValidatorTest extends VertxTest {
     private static final String EPLANNING = "eplanning";
     private static final String BEACHFRONT = "beachfront";
     private static final String VISX = "visx";
+    private static final String ADRINO = "adrino";
 
-    @Mock
+    @Mock(strictness = LENIENT)
     private BidderCatalog bidderCatalog;
 
     private BidderParamValidator bidderParamValidator;
@@ -65,7 +68,8 @@ public void setUp() {
                 OPENX,
                 EPLANNING,
                 BEACHFRONT,
-                VISX)));
+                VISX,
+                ADRINO)));
         given(bidderCatalog.bidderInfoByName(anyString())).willReturn(givenBidderInfo());
         given(bidderCatalog.bidderInfoByName(eq(APPNEXUS_ALIAS))).willReturn(givenBidderInfo(APPNEXUS));
 
@@ -381,6 +385,20 @@ public void validateShouldReturnNoValidationMessagesWhenVisxUidValid() {
         assertThat(messagesIntegerUid).isEmpty();
     }
 
+    @Test
+    public void validateShouldReturnValidationMessagesWhenAdrinoImpExtNotValid() {
+        // given
+        final ExtImpAdrino ext = ExtImpAdrino.of(null);
+
+        final JsonNode node = mapper.convertValue(ext, JsonNode.class);
+
+        // when
+        final Set<String> messages = bidderParamValidator.validate(ADRINO, node);
+
+        // then
+        assertThat(messages.size()).isEqualTo(1);
+    }
+
     private static BidderInfo givenBidderInfo(String aliasOf) {
         return BidderInfo.create(
                 true,