diff --git a/modules/smartadserverBidAdapter.js b/modules/smartadserverBidAdapter.js
index 840ba8a82aa..53b13ecf944 100644
--- a/modules/smartadserverBidAdapter.js
+++ b/modules/smartadserverBidAdapter.js
@@ -6,7 +6,6 @@ import {
   isEmpty,
   isFn,
   isInteger,
-  isPlainObject,
   logError
 } from '../src/utils.js';
 import { BANNER, VIDEO } from '../src/mediaTypes.js';
@@ -176,7 +175,7 @@ export const spec = {
    * Makes server requests from the list of BidRequests.
    *
    * @param {BidRequest[]} validBidRequests an array of bids
-   * @param {BidderRequest} bidderRequest bidder request object
+   * @param {BidRequest} bidderRequest bidder request object
    * @return {ServerRequest[]} Info describing the request to the server.
    */
   buildRequests: function (validBidRequests, bidderRequest) {
@@ -332,18 +331,22 @@ export const spec = {
    * @param {string} mediaType Bid media type
    * @return {number} Floor price
    */
-  getBidFloor: function (bid, currency, mediaType) {
-    if (!isFn(bid.getFloor)) {
-      return DEFAULT_FLOOR;
+  getBidFloor: (bid, currency, mediaType) => {
+    const floors = [];
+
+    if (isFn(bid.getFloor)) {
+      (deepAccess(bid, `mediaTypes.${mediaType}.${mediaType === BANNER ? 'sizes' : 'playerSize'}`) || []).forEach(size => {
+        const floor = bid.getFloor({
+          currency: currency || 'USD',
+          mediaType,
+          size
+        }).floor;
+
+        floors.push(!isNaN(floor) ? floor : DEFAULT_FLOOR);
+      });
     }
 
-    const floor = bid.getFloor({
-      currency: currency || 'USD',
-      mediaType,
-      size: '*'
-    });
-
-    return isPlainObject(floor) && !isNaN(floor.floor) ? floor.floor : DEFAULT_FLOOR;
+    return floors.length ? Math.min(...floors) : DEFAULT_FLOOR;
   },
 
   /**
diff --git a/test/spec/modules/smartadserverBidAdapter_spec.js b/test/spec/modules/smartadserverBidAdapter_spec.js
index 08b9f616551..3ee00a99bd9 100644
--- a/test/spec/modules/smartadserverBidAdapter_spec.js
+++ b/test/spec/modules/smartadserverBidAdapter_spec.js
@@ -1311,17 +1311,6 @@ describe('Smart bid adapter tests', function () {
       expect(bidRequest.bidfloor).to.deep.equal(DEFAULT_PARAMS[0].params.bidfloor);
     });
 
-    it('should return floor from module', function() {
-      const moduleFloor = 1.5;
-      const bidRequest = JSON.parse((spec.buildRequests(DEFAULT_PARAMS_WO_OPTIONAL))[0].data);
-      bidRequest.getFloor = function () {
-        return { floor: moduleFloor };
-      };
-
-      const floor = spec.getBidFloor(bidRequest, 'EUR');
-      expect(floor).to.deep.equal(moduleFloor);
-    });
-
     it('should return default floor when module not activated', function() {
       const bidRequest = JSON.parse((spec.buildRequests(DEFAULT_PARAMS_WO_OPTIONAL))[0].data);
 
@@ -1425,6 +1414,95 @@ describe('Smart bid adapter tests', function () {
       expect(bannerRequest).to.not.equal(null).and.to.not.be.undefined;
       expect(bannerRequest).to.have.property('bidfloor').and.to.equal(1.93);
     });
+
+    describe('#getBidFloor', () => {
+      let bid;
+      beforeEach(() => {
+        bid = {
+          mediaTypes: {
+            banner: {
+              sizes: [
+                [300, 250],
+                [300, 600]
+              ]
+            }
+          },
+          getFloor: (data) => {
+            if (data.currency === 'USD') {
+              if (data.mediaType === BANNER) {
+                if (data.size[0] === 300 && data.size[1] === 250) {
+                  return { floor: 1.2 };
+                } else if (data.size[0] === 300 && data.size[1] === 600) {
+                  return { floor: 1.4 };
+                } else if (data.size[0] === 30 && data.size[1] === 60) {
+                  return 'string';
+                } else {
+                  return { floor: 1.0 };
+                }
+              } else if (data.mediaType === VIDEO) {
+                if (data.size[0] === 640 && data.size[1] === 480) {
+                  return { floor: 2.3 };
+                } else {
+                  return { floor: 2.1 };
+                }
+              } else {
+                return {};
+              }
+            } else {
+              return undefined;
+            }
+          }
+        };
+      });
+
+      it('should return lowest floor from specified ones', () => {
+        expect(spec.getBidFloor(bid, 'USD', BANNER)).to.deep.eq(1.2);
+      });
+
+      it('should return default floor for media type whatever size', () => {
+        bid.mediaTypes.banner.sizes.push([300, 400]);
+        expect(spec.getBidFloor(bid, 'USD', BANNER)).to.deep.eq(1.0);
+      });
+
+      it('should return default floor', () => {
+        expect(spec.getBidFloor(bid, 'USD', VIDEO)).to.deep.eq(0);
+      });
+
+      it('should return floor when currency not passed', () => {
+        expect(spec.getBidFloor(bid, undefined, BANNER)).to.deep.eq(1.2);
+      });
+
+      it('should return DEFAULT_FLOOR in case of not a number value from floor module', () => {
+        bid.mediaTypes.banner.sizes.push([30, 60]);
+        expect(spec.getBidFloor(bid, 'USD', BANNER)).to.deep.eq(0);
+      });
+
+      it('should return proper video floor', () => {
+        bid.mediaTypes = {
+          video: {
+            playerSize: [
+              [640, 480]
+            ]
+          }
+        };
+        expect(spec.getBidFloor(bid, 'USD', VIDEO)).to.deep.eq(2.3);
+      });
+
+      it('should return default video floor', () => {
+        bid.mediaTypes = {
+          video: {
+            playerSize: [
+              [640, 490]
+            ]
+          }
+        };
+        expect(spec.getBidFloor(bid, 'USD', VIDEO)).to.deep.eq(2.1);
+      });
+
+      it('should return DEFAULT_FLOOR for not supported media type', () => {
+        expect(spec.getBidFloor(bid, 'USD', 'test')).to.deep.eq(0);
+      });
+    });
   });
 
   describe('Verify bid requests with multiple mediaTypes', function () {