diff --git a/modules/gridBidAdapter.js b/modules/gridBidAdapter.js
index ce191a398b9..3e75b666d78 100644
--- a/modules/gridBidAdapter.js
+++ b/modules/gridBidAdapter.js
@@ -96,12 +96,17 @@ export const spec = {
           divid: adUnitCode.toString()
         }
       };
-      if (ortb2Imp && ortb2Imp.ext && ortb2Imp.ext.data) {
-        impObj.ext.data = ortb2Imp.ext.data;
-        if (impObj.ext.data.adserver && impObj.ext.data.adserver.adslot) {
-          impObj.ext.gpid = impObj.ext.data.adserver.adslot.toString();
-        } else {
-          impObj.ext.gpid = ortb2Imp.ext.data.pbadslot && ortb2Imp.ext.data.pbadslot.toString();
+      if (ortb2Imp) {
+        if (ortb2Imp.instl) {
+          impObj.instl = ortb2Imp.instl;
+        }
+        if (ortb2Imp.ext && ortb2Imp.ext.data) {
+          impObj.ext.data = ortb2Imp.ext.data;
+          if (impObj.ext.data.adserver && impObj.ext.data.adserver.adslot) {
+            impObj.ext.gpid = impObj.ext.data.adserver.adslot.toString();
+          } else {
+            impObj.ext.gpid = ortb2Imp.ext.data.pbadslot && ortb2Imp.ext.data.pbadslot.toString();
+          }
         }
       }
       if (!isEmpty(keywords)) {
diff --git a/test/spec/modules/gridBidAdapter_spec.js b/test/spec/modules/gridBidAdapter_spec.js
index 42ac6e1c560..a22097bdde3 100644
--- a/test/spec/modules/gridBidAdapter_spec.js
+++ b/test/spec/modules/gridBidAdapter_spec.js
@@ -599,6 +599,32 @@ describe('TheMediaGrid Adapter', function () {
       });
     });
 
+    it('should contain imp[].instl if available', function() {
+      const ortb2Imp = [{
+        instl: 1
+      }, {
+        instl: 2,
+        ext: {
+          data: {
+            adserver: {
+              name: 'ad_server_name',
+              adslot: '/222222/slot'
+            },
+            pbadslot: '/222222/slot'
+          }
+        }
+      }];
+      const bidRequestsWithOrtb2Imp = bidRequests.slice(0, 3).map((bid, ind) => {
+        return Object.assign(ortb2Imp[ind] ? { ortb2Imp: ortb2Imp[ind] } : {}, bid);
+      });
+      const request = spec.buildRequests(bidRequestsWithOrtb2Imp, bidderRequest);
+      expect(request.data).to.be.an('string');
+      const payload = parseRequest(request.data);
+      expect(payload.imp[0].instl).to.equal(1);
+      expect(payload.imp[1].instl).to.equal(2);
+      expect(payload.imp[2].instl).to.be.undefined;
+    });
+
     it('all id must be a string', function() {
       const fpdUserIdNumVal = 2345543345;
       const getDataFromLocalStorageStub = sinon.stub(storage, 'getDataFromLocalStorage').callsFake(