diff --git a/src/main/java/org/prebid/server/bidder/unruly/UnrulyBidder.java b/src/main/java/org/prebid/server/bidder/unruly/UnrulyBidder.java
index ee0471a937f..feac7f16ab0 100644
--- a/src/main/java/org/prebid/server/bidder/unruly/UnrulyBidder.java
+++ b/src/main/java/org/prebid/server/bidder/unruly/UnrulyBidder.java
@@ -15,11 +15,10 @@
 import org.prebid.server.bidder.model.BidderError;
 import org.prebid.server.bidder.model.HttpRequest;
 import org.prebid.server.bidder.model.Result;
+import org.prebid.server.bidder.unruly.proto.UnrulyExtPrebid;
 import org.prebid.server.exception.PreBidException;
 import org.prebid.server.json.DecodeException;
 import org.prebid.server.json.JacksonMapper;
-import org.prebid.server.proto.openrtb.ext.ExtPrebid;
-import org.prebid.server.proto.openrtb.ext.request.unruly.ExtImpUnruly;
 import org.prebid.server.proto.openrtb.ext.response.BidType;
 import org.prebid.server.proto.openrtb.ext.response.ExtBidPrebid;
 import org.prebid.server.proto.openrtb.ext.response.ExtBidPrebidVideo;
@@ -34,7 +33,7 @@
 
 public class UnrulyBidder implements Bidder<BidRequest> {
 
-    private static final TypeReference<ExtPrebid<?, ExtImpUnruly>> UNRULY_EXT_TYPE_REFERENCE =
+    private static final TypeReference<UnrulyExtPrebid> UNRULY_EXT_TYPE_REFERENCE =
             new TypeReference<>() {
             };
 
@@ -58,14 +57,17 @@ public Result<List<HttpRequest<BidRequest>>> makeHttpRequests(BidRequest request
 
     private Imp modifyImp(Imp imp) {
 
+        final UnrulyExtPrebid unrulyExtPrebid = parseImpExt(imp);
         return imp.toBuilder()
-                .ext(mapper.mapper().valueToTree(ExtPrebid.of(null, parseImpExt(imp))))
+                .ext(mapper.mapper().valueToTree(UnrulyExtPrebid.of(
+                        unrulyExtPrebid.getBidder(),
+                        unrulyExtPrebid.getGpid())))
                 .build();
     }
 
-    private ExtImpUnruly parseImpExt(Imp imp) {
+    private UnrulyExtPrebid parseImpExt(Imp imp) {
         try {
-            return mapper.mapper().convertValue(imp.getExt(), UNRULY_EXT_TYPE_REFERENCE).getBidder();
+            return mapper.mapper().convertValue(imp.getExt(), UNRULY_EXT_TYPE_REFERENCE);
         } catch (IllegalArgumentException e) {
             throw new PreBidException(e.getMessage());
         }
diff --git a/src/main/java/org/prebid/server/bidder/unruly/proto/UnrulyExtPrebid.java b/src/main/java/org/prebid/server/bidder/unruly/proto/UnrulyExtPrebid.java
new file mode 100644
index 00000000000..f34ec91894f
--- /dev/null
+++ b/src/main/java/org/prebid/server/bidder/unruly/proto/UnrulyExtPrebid.java
@@ -0,0 +1,12 @@
+package org.prebid.server.bidder.unruly.proto;
+
+import lombok.Value;
+import org.prebid.server.proto.openrtb.ext.request.unruly.ExtImpUnruly;
+
+@Value(staticConstructor = "of")
+public class UnrulyExtPrebid {
+
+    ExtImpUnruly bidder;
+
+    String gpid;
+}
diff --git a/src/test/java/org/prebid/server/bidder/unruly/UnrulyBidderTest.java b/src/test/java/org/prebid/server/bidder/unruly/UnrulyBidderTest.java
index 82cee73461a..c059eb1f291 100644
--- a/src/test/java/org/prebid/server/bidder/unruly/UnrulyBidderTest.java
+++ b/src/test/java/org/prebid/server/bidder/unruly/UnrulyBidderTest.java
@@ -1,6 +1,7 @@
 package org.prebid.server.bidder.unruly;
 
 import com.fasterxml.jackson.core.JsonProcessingException;
+import com.fasterxml.jackson.databind.JsonNode;
 import com.fasterxml.jackson.databind.node.IntNode;
 import com.fasterxml.jackson.databind.node.ObjectNode;
 import com.fasterxml.jackson.databind.node.TextNode;
@@ -19,7 +20,8 @@
 import org.prebid.server.bidder.model.HttpRequest;
 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.bidder.unruly.proto.UnrulyExtPrebid;
+import org.prebid.server.proto.openrtb.ext.request.unruly.ExtImpUnruly;
 
 import java.util.List;
 import java.util.Map;
@@ -65,6 +67,27 @@ public void makeHttpRequestsShouldReturnOneRequestPerImpWithExpectedHeaders() {
                         tuple("Accept", "application/json"));
     }
 
+    @Test
+    public void makeHttpRequestsShouldPassThroughGPID() {
+        // given
+        final BidRequest bidRequest = BidRequest.builder()
+                .imp(singletonList(givenImp(identity())))
+                .build();
+
+        // when
+        final Result<List<HttpRequest<BidRequest>>> result = target.makeHttpRequests(bidRequest);
+
+        // then
+        assertThat(result.getValue()).hasSize(1)
+                .extracting(HttpRequest::getPayload)
+                .flatExtracting(BidRequest::getImp)
+                .extracting(Imp::getExt)
+                .extracting(ext -> ext.get("gpid"))
+                .extracting(JsonNode::asText)
+                .first()
+                .isEqualTo("gpid");
+    }
+
     @Test
     public void makeBidsShouldReturnErrorIfResponseBodyCouldNotBeParsed() {
         // given
@@ -288,7 +311,7 @@ private static BidRequest givenBidRequest(Function<Imp.ImpBuilder, Imp.ImpBuilde
 
     private static Imp givenImp(Function<Imp.ImpBuilder, Imp.ImpBuilder> impCustomizer) {
         final ObjectNode impExt = mapper.valueToTree(
-                ExtPrebid.of(null, mapper.createObjectNode().set("siteId", IntNode.valueOf(123))));
+                UnrulyExtPrebid.of(ExtImpUnruly.of(123), "gpid"));
 
         return impCustomizer.apply(
                         Imp.builder()