diff --git a/src/main/java/org/prebid/server/bidder/alkimi/AlkimiBidder.java b/src/main/java/org/prebid/server/bidder/alkimi/AlkimiBidder.java
index 03a05d1b1aa..f1a48242f63 100644
--- a/src/main/java/org/prebid/server/bidder/alkimi/AlkimiBidder.java
+++ b/src/main/java/org/prebid/server/bidder/alkimi/AlkimiBidder.java
@@ -67,13 +67,16 @@ private ExtImpAlkimi parseImpExt(Imp imp) {
     private Imp updateImp(Imp imp, ExtImpAlkimi extImpAlkimi) {
         final Price bidFloorPrice = Price.of(imp.getBidfloorcur(), imp.getBidfloor());
 
+        final ObjectNode newExt = imp.getExt().deepCopy();
+        newExt.replace("bidder", makeImpExt(imp, extImpAlkimi));
+
         return imp.toBuilder()
                 .bidfloor(BidderUtil.isValidPrice(bidFloorPrice)
                         ? bidFloorPrice.getValue()
                         : extImpAlkimi.getBidFloor())
                 .instl(extImpAlkimi.getInstl())
                 .exp(extImpAlkimi.getExp())
-                .ext(makeImpExt(imp, extImpAlkimi))
+                .ext(newExt)
                 .build();
     }
 
@@ -82,7 +85,7 @@ private ObjectNode makeImpExt(Imp imp, ExtImpAlkimi extImpAlkimi) {
 
         extBuilder.adUnitCode(imp.getId());
 
-        return mapper.mapper().valueToTree(ExtPrebid.of(null, extBuilder.build()));
+        return mapper.mapper().valueToTree(extBuilder.build());
     }
 
     @Override
diff --git a/src/test/java/org/prebid/server/bidder/alkimi/AlkimiBidderTest.java b/src/test/java/org/prebid/server/bidder/alkimi/AlkimiBidderTest.java
index 26f40393f31..b794156db3f 100644
--- a/src/test/java/org/prebid/server/bidder/alkimi/AlkimiBidderTest.java
+++ b/src/test/java/org/prebid/server/bidder/alkimi/AlkimiBidderTest.java
@@ -25,6 +25,7 @@
 import java.math.BigDecimal;
 import java.util.Collections;
 import java.util.List;
+import java.util.Map;
 import java.util.function.Function;
 
 import static java.util.Collections.singletonList;
@@ -109,9 +110,10 @@ private Banner expectedBanner() {
     }
 
     private ObjectNode expectedBannerExt() {
-        return mapper.valueToTree(ExtPrebid.of(
-                null,
-                ExtImpAlkimi.builder()
+        return mapper.valueToTree(Map.of(
+                "tid", "12345",
+                "gpid", "300x250",
+                "bidder", ExtImpAlkimi.builder()
                         .token(PUB_TOKEN)
                         .bidFloor(BigDecimal.valueOf(0.2))
                         .instl(1)
@@ -252,9 +254,10 @@ private static Imp givenBannerImp(Function<Imp.ImpBuilder, Imp.ImpBuilder> impCu
                                 .h(250)
                                 .build())
                         ).build())
-                .ext(mapper.valueToTree(ExtPrebid.of(
-                        null,
-                        ExtImpAlkimi.builder()
+                .ext(mapper.valueToTree(Map.of(
+                        "tid", "12345",
+                        "gpid", "300x250",
+                        "bidder", ExtImpAlkimi.builder()
                                 .token(PUB_TOKEN)
                                 .bidFloor(BigDecimal.valueOf(0.2))
                                 .instl(1)
diff --git a/src/test/resources/org/prebid/server/it/openrtb2/alkimi/test-alkimi-bid-request.json b/src/test/resources/org/prebid/server/it/openrtb2/alkimi/test-alkimi-bid-request.json
index 812912a1350..90c8e1f416c 100644
--- a/src/test/resources/org/prebid/server/it/openrtb2/alkimi/test-alkimi-bid-request.json
+++ b/src/test/resources/org/prebid/server/it/openrtb2/alkimi/test-alkimi-bid-request.json
@@ -13,6 +13,8 @@
       },
       "bidfloor": 0.5,
       "ext": {
+        "tid": "${json-unit.any-string}",
+        "gpid": "640x480",
         "bidder": {
           "token": "XXX",
           "bidFloor": 0.5,
diff --git a/src/test/resources/org/prebid/server/it/openrtb2/alkimi/test-auction-alkimi-request.json b/src/test/resources/org/prebid/server/it/openrtb2/alkimi/test-auction-alkimi-request.json
index 01f1964b9aa..b0bfd234de2 100644
--- a/src/test/resources/org/prebid/server/it/openrtb2/alkimi/test-auction-alkimi-request.json
+++ b/src/test/resources/org/prebid/server/it/openrtb2/alkimi/test-auction-alkimi-request.json
@@ -11,6 +11,7 @@
         "h": 480
       },
       "ext": {
+        "gpid": "640x480",
         "alkimi": {
           "bidFloor": 0.5,
           "token": "XXX"