diff --git a/modules/emx_digitalBidAdapter.js b/modules/emx_digitalBidAdapter.js
index 5638fa24e31..925c062a8cb 100644
--- a/modules/emx_digitalBidAdapter.js
+++ b/modules/emx_digitalBidAdapter.js
@@ -11,12 +11,25 @@ import {
 
 const BIDDER_CODE = 'emx_digital';
 const ENDPOINT = 'hb.emxdgt.com';
+
+let emxAdapter = {};
+
+emxAdapter.validateSizes = function(sizes) {
+  if (!utils.isArray(sizes) || typeof sizes[0] === 'undefined') {
+    return false;
+  }
+  return sizes.every(size => utils.isArray(size) && size.length === 2);
+}
+
 export const spec = {
   code: BIDDER_CODE,
   supportedMediaTypes: [BANNER],
   isBidRequestValid: function (bid) {
-    return !!bid.params.tagid && typeof bid.params.tagid === 'string' &&
-            (typeof bid.params.bidfloor === 'undefined' || typeof bid.params.bidfloor === 'string');
+    return !!bid.params.tagid &&
+            typeof bid.params.tagid === 'string' &&
+            (typeof bid.params.bidfloor === 'undefined' || typeof bid.params.bidfloor === 'string') &&
+            bid.bidder === BIDDER_CODE &&
+            (emxAdapter.validateSizes(bid.mediaTypes.banner.sizes) || emxAdapter.validateSizes(bid.sizes));
   },
   buildRequests: function (validBidRequests, bidRequests) {
     const {host, href, protocol} = utils.getTopWindowLocation();
@@ -29,22 +42,26 @@ export const spec = {
     const networkProtocol = protocol.indexOf('https') > -1 ? 1 : 0;
 
     utils._each(validBidRequests, function (bid) {
-      let tagId = String(utils.getBidIdParameter('tagid', bid.params));
+      let tagId = utils.getBidIdParameter('tagid', bid.params);
       let bidFloor = parseFloat(utils.getBidIdParameter('bidfloor', bid.params)) || 0;
+      let sizes = bid.mediaTypes.banner.sizes;
+      if (!emxAdapter.validateSizes(sizes)) {
+        sizes = bid.sizes
+      }
       let emxBid = {
         id: bid.bidId,
         tid: bid.transactionId,
         tagid: tagId,
         secure: networkProtocol,
         banner: {
-          format: bid.sizes.map(function (size) {
+          format: sizes.map(function (size) {
             return {
               w: size[0],
               h: size[1]
             };
           }),
-          w: bid.sizes[0][0],
-          h: bid.sizes[0][1]
+          w: sizes[0][0],
+          h: sizes[0][1]
         }
       }
       if (bidFloor > 0) {
diff --git a/test/spec/modules/emx_digitalBidAdapter_spec.js b/test/spec/modules/emx_digitalBidAdapter_spec.js
index dd34582e22d..85256c20bd9 100644
--- a/test/spec/modules/emx_digitalBidAdapter_spec.js
+++ b/test/spec/modules/emx_digitalBidAdapter_spec.js
@@ -18,6 +18,14 @@ describe('emx_digital Adapter', function () {
       'params': {
         'tagid': '25251'
       },
+      'mediaTypes': {
+        'banner': {
+          'sizes': [
+            [300, 250],
+            [300, 600]
+          ]
+        }
+      },
       'adUnitCode': 'adunit-code',
       'sizes': [
         [300, 250],
@@ -34,16 +42,69 @@ describe('emx_digital Adapter', function () {
 
     it('should contain tagid param', function () {
       expect(spec.isBidRequestValid({
-        params: {}
+        bidder: 'emx_digital',
+        params: {},
+        mediaTypes: {
+          banner: {
+            sizes: [
+              [300, 250],
+              [300, 600]
+            ]
+          }
+        }
       })).to.equal(false);
       expect(spec.isBidRequestValid({
+        bidder: 'emx_digital',
         params: {
           tagid: ''
+        },
+        mediaTypes: {
+          banner: {
+            sizes: [
+              [300, 250],
+              [300, 600]
+            ]
+          }
+        }
+      })).to.equal(false);
+      expect(spec.isBidRequestValid({
+        bidder: 'emx_digital',
+        params: {
+          tagid: '123'
+        },
+        mediaTypes: {
+          banner: {
+            sizes: [
+            ]
+          }
+        }
+      })).to.equal(false);
+      expect(spec.isBidRequestValid({
+        bidder: 'emxdigital',
+        params: {
+          tagid: '123'
+        },
+        mediaTypes: {
+          banner: {
+            sizes: [
+              [300, 250],
+              [300, 600]
+            ]
+          }
         }
       })).to.equal(false);
       expect(spec.isBidRequestValid({
+        bidder: 'emx_digital',
         params: {
           tagid: '123'
+        },
+        mediaTypes: {
+          banner: {
+            sizes: [
+              [300, 250],
+              [300, 600]
+            ]
+          }
         }
       })).to.equal(true);
     });