diff --git a/modules/yieldlabBidAdapter.js b/modules/yieldlabBidAdapter.js
index 682eca6be0dc..31e9b35f1782 100644
--- a/modules/yieldlabBidAdapter.js
+++ b/modules/yieldlabBidAdapter.js
@@ -186,7 +186,7 @@ export const spec = {
           // there may be publishers still rely on it
           bidResponse.adUrl = `${ENDPOINT}/d/${matchedBid.id}/${bidRequest.params.supplyId}/?ts=${timestamp}${extId}${gdprApplies}${gdprConsent}${pvId}`;
           bidResponse.mediaType = NATIVE;
-          const nativeImageAssetObj = find(matchedBid.native.assets, asset => hasValidProperty(asset, 'img'));
+          const nativeImageAssetObj = find(matchedBid.native.assets, asset => isMainImage(asset));
           const nativeImageAsset = nativeImageAssetObj ? nativeImageAssetObj.img : { url: '', w: 0, h: 0 };
           const nativeTitleAsset = find(matchedBid.native.assets, asset => hasValidProperty(asset, 'title'));
           const nativeBodyAsset = find(matchedBid.native.assets, asset => hasValidProperty(asset, 'data'));
@@ -516,4 +516,15 @@ function hasValidProperty(obj, propName) {
   return obj.hasOwnProperty(propName) && obj[propName] != null;
 }
 
+/**
+ * Checks if an asset object is a main image.
+ * A main image is defined as an image asset whose type value is 3.
+ *
+ * @param {Object} asset - The asset object to check.
+ * @returns {boolean} Returns true if the object has a property img.type with a value of 3, otherwise false.
+ */
+function isMainImage(asset) {
+  return asset?.img?.type === 3
+}
+
 registerBidder(spec);
diff --git a/test/spec/modules/yieldlabBidAdapter_spec.js b/test/spec/modules/yieldlabBidAdapter_spec.js
index 57f13468c0ff..76c4aca4f42c 100644
--- a/test/spec/modules/yieldlabBidAdapter_spec.js
+++ b/test/spec/modules/yieldlabBidAdapter_spec.js
@@ -191,6 +191,7 @@ const NATIVE_RESPONSE = Object.assign({}, RESPONSE, {
           url: 'https://localhost:8080/yl-logo100x100.jpg',
           w: 100,
           h: 100,
+          type: 3,
         },
       },
       {
@@ -557,7 +558,6 @@ describe('yieldlabBidAdapter', () => {
 
     it('should add adUrl and native assets when type is Native', () => {
       const result = spec.interpretResponse({body: [NATIVE_RESPONSE]}, {validBidRequests: [NATIVE_REQUEST()], queryParams: REQPARAMS});
-
       expect(result[0].requestId).to.equal('2d925f27f5079f');
       expect(result[0].cpm).to.equal(0.01);
       expect(result[0].mediaType).to.equal('native');