diff --git a/modules/pubmaticBidAdapter.js b/modules/pubmaticBidAdapter.js
index 79356415ddf..b78b1fc96ba 100644
--- a/modules/pubmaticBidAdapter.js
+++ b/modules/pubmaticBidAdapter.js
@@ -929,7 +929,16 @@ function _assignRenderer(newBid, request) {
       newBid.renderer = BB_RENDERER.newRenderer(newBid.rendererCode, adUnitCode);
     }
   }
-};
+}
+
+function isNonEmptyArray(test) {
+  if (utils.isArray(test) === true) {
+    if (test.length > 0) {
+      return true;
+    }
+  }
+  return false;
+}
 
 export const spec = {
   code: BIDDER_CODE,
@@ -949,15 +958,23 @@ export const spec = {
       }
       // video ad validation
       if (bid.hasOwnProperty('mediaTypes') && bid.mediaTypes.hasOwnProperty(VIDEO)) {
-        if (!bid.mediaTypes.video.mimes || (bid.params.video && (!bid.params.video.hasOwnProperty('mimes') || !utils.isArray(bid.params.video.mimes) || bid.params.video.mimes.length === 0))) {
-          utils.logWarn(LOG_WARN_PREFIX + 'Error: For video ads, mimes is mandatory and must specify atlease 1 mime value. Call to OpenBid will not be sent for ad unit:' + JSON.stringify(bid));
+        // bid.mediaTypes.video.mimes OR bid.params.video.mimes should be present and must be a non-empty array
+        let mediaTypesVideoMimes = utils.deepAccess(bid.mediaTypes, 'video.mimes');
+        let paramsVideoMimes = utils.deepAccess(bid, 'params.video.mimes');
+        if (isNonEmptyArray(mediaTypesVideoMimes) === false && isNonEmptyArray(paramsVideoMimes) === false) {
+          utils.logWarn(LOG_WARN_PREFIX + 'Error: For video ads, bid.mediaTypes.video.mimes OR bid.params.video.mimes should be present and must be a non-empty array. Call to OpenBid will not be sent for ad unit:' + JSON.stringify(bid));
           return false;
         }
+
         if (!bid.mediaTypes[VIDEO].hasOwnProperty('context')) {
           utils.logError(`${LOG_WARN_PREFIX}: no context specified in bid. Rejecting bid: `, bid);
           return false;
         }
-        if (bid.mediaTypes[VIDEO].context === 'outstream' && !utils.isStr(bid.params.outstreamAU) && !bid.hasOwnProperty('renderer') && !bid.mediaTypes[VIDEO].hasOwnProperty('renderer')) {
+
+        if (bid.mediaTypes[VIDEO].context === 'outstream' &&
+          !utils.isStr(bid.params.outstreamAU) &&
+          !bid.hasOwnProperty('renderer') &&
+          !bid.mediaTypes[VIDEO].hasOwnProperty('renderer')) {
           utils.logError(`${LOG_WARN_PREFIX}: for "outstream" bids either outstreamAU parameter must be provided or ad unit supplied renderer is required. Rejecting bid: `, bid);
           return false;
         }
diff --git a/test/spec/modules/pubmaticBidAdapter_spec.js b/test/spec/modules/pubmaticBidAdapter_spec.js
index ae0b351c367..80ce93858d5 100644
--- a/test/spec/modules/pubmaticBidAdapter_spec.js
+++ b/test/spec/modules/pubmaticBidAdapter_spec.js
@@ -864,78 +864,72 @@ describe('PubMatic adapter', function () {
         expect(isValid).to.equal(false);
       })
 
-      it('should check for mimes if video is present', function() {
+      it('bid.mediaTypes.video.mimes OR bid.params.video.mimes should be present and must be a non-empty array', function() {
         let bid = {
-            'bidder': 'pubmatic',
-            'params': {
-              'adSlot': 'SLOT_NHB1@728x90',
-              'publisherId': '5890'
-            },
-            'mediaTypes': {
-              'video': {
-                'playerSize': [
-                  [640, 480]
-                ],
-                'protocols': [1, 2, 5],
-                'context': 'instream',
-                'mimes': ['video/flv'],
-                'skippable': false,
-                'skip': 1,
-                'linearity': 2
-              }
-            },
-            'adUnitCode': 'video1',
-            'transactionId': '803e3750-0bbe-4ffe-a548-b6eca15087bf',
-            'sizes': [
-              [640, 480]
-            ],
-            'bidId': '2c95df014cfe97',
-            'bidderRequestId': '1fe59391566442',
-            'auctionId': '3a4118ef-fb96-4416-b0b0-3cfc1cebc142',
-            'src': 'client',
-            'bidRequestsCount': 1,
-            'bidderRequestsCount': 1,
-            'bidderWinsCount': 0
+          'bidder': 'pubmatic',
+          'params': {
+            'adSlot': 'SLOT_NHB1@728x90',
+            'publisherId': '5890',
+            'video': {}
           },
-          isValid = spec.isBidRequestValid(bid);
-        expect(isValid).to.equal(true);
-      })
-
-      it('should return false if mimes is not present in video', function() {
-        let bid = {
-            'bidder': 'pubmatic',
-            'params': {
-              'adSlot': 'SLOT_NHB1@728x90',
-              'publisherId': '5890'
-            },
-            'mediaTypes': {
-              'video': {
-                'playerSize': [
-                  [640, 480]
-                ],
-                'protocols': [1, 2, 5],
-                'context': 'instream',
-                'skippable': false,
-                'skip': 1,
-                'linearity': 2
-              }
-            },
-            'adUnitCode': 'video1',
-            'transactionId': '803e3750-0bbe-4ffe-a548-b6eca15087bf',
-            'sizes': [
-              [640, 480]
-            ],
-            'bidId': '2c95df014cfe97',
-            'bidderRequestId': '1fe59391566442',
-            'auctionId': '3a4118ef-fb96-4416-b0b0-3cfc1cebc142',
-            'src': 'client',
-            'bidRequestsCount': 1,
-            'bidderRequestsCount': 1,
-            'bidderWinsCount': 0
+          'mediaTypes': {
+            'video': {
+              'playerSize': [
+                [640, 480]
+              ],
+              'protocols': [1, 2, 5],
+              'context': 'instream',
+              'skippable': false,
+              'skip': 1,
+              'linearity': 2
+            }
           },
-          isValid = spec.isBidRequestValid(bid);
-        expect(isValid).to.equal(false);
-      })
+          'adUnitCode': 'video1',
+          'transactionId': '803e3750-0bbe-4ffe-a548-b6eca15087bf',
+          'sizes': [
+            [640, 480]
+          ],
+          'bidId': '2c95df014cfe97',
+          'bidderRequestId': '1fe59391566442',
+          'auctionId': '3a4118ef-fb96-4416-b0b0-3cfc1cebc142',
+          'src': 'client',
+          'bidRequestsCount': 1,
+          'bidderRequestsCount': 1,
+          'bidderWinsCount': 0
+        };
+
+        delete bid.params.video.mimes; // Undefined
+        bid.mediaTypes.video.mimes = 'string'; // NOT array
+        expect(spec.isBidRequestValid(bid)).to.equal(false);
+
+        delete bid.params.video.mimes; // Undefined
+        delete bid.mediaTypes.video.mimes; // Undefined
+        expect(spec.isBidRequestValid(bid)).to.equal(false);
+
+        delete bid.params.video.mimes; // Undefined
+        bid.mediaTypes.video.mimes = ['video/flv']; // Valid
+        expect(spec.isBidRequestValid(bid)).to.equal(true);
+
+        delete bid.mediaTypes.video.mimes; // mediaTypes.video.mimes undefined
+        bid.params.video = {mimes: 'string'}; // NOT array
+        expect(spec.isBidRequestValid(bid)).to.equal(false);
+
+        delete bid.mediaTypes.video.mimes; // mediaTypes.video.mimes undefined
+        delete bid.params.video.mimes; // Undefined
+        expect(spec.isBidRequestValid(bid)).to.equal(false);
+
+        delete bid.mediaTypes.video.mimes; // mediaTypes.video.mimes undefined
+        bid.params.video.mimes = ['video/flv']; // Valid
+        expect(spec.isBidRequestValid(bid)).to.equal(true);
+
+        delete bid.mediaTypes.video.mimes; // Undefined
+        bid.params.video.mimes = ['video/flv']; // Valid
+        expect(spec.isBidRequestValid(bid)).to.equal(true);
+
+        delete bid.mediaTypes.video.mimes; // Undefined
+        delete bid.params.video.mimes; // Undefined
+        expect(spec.isBidRequestValid(bid)).to.equal(false);
+      });
     });
 
   	describe('Request formation', function () {