diff --git a/integrationExamples/gpt/pbjs_example_gpt.html b/integrationExamples/gpt/pbjs_example_gpt.html
index 6852b9f680a..dcc67ae0f74 100644
--- a/integrationExamples/gpt/pbjs_example_gpt.html
+++ b/integrationExamples/gpt/pbjs_example_gpt.html
@@ -418,7 +418,8 @@
                     {
                         bidder: 'gumgum',
                         params: {
-                            inScreen: 'ggumtest' // REQUIRED str Tracking Id
+                            inScreen: 'ggumtest', // REQUIRED str Tracking Id
+                            bidfloor: 0.01        // OPTIONAL number CPM bid
                         }
                     },
                     {
diff --git a/modules/gumgumBidAdapter.js b/modules/gumgumBidAdapter.js
index 9702eb14f0c..f66d056fb49 100644
--- a/modules/gumgumBidAdapter.js
+++ b/modules/gumgumBidAdapter.js
@@ -103,6 +103,12 @@ function isBidRequestValid (bid) {
       utils.logWarn(`[GumGum] No product selected for the placement ${adUnitCode}, please check your implementation.`);
       return false;
   }
+
+  if (params.bidfloor && !(typeof params.bidfloor === 'number' && isFinite(params.bidfloor))) {
+    utils.logWarn('[GumGum] bidfloor must be a Number');
+    return false;
+  }
+
   return true;
 }
 
@@ -126,6 +132,9 @@ function buildRequests (validBidRequests, bidderRequest) {
     if (pageViewId) {
       data.pv = pageViewId
     }
+    if (params.bidfloor) {
+      data.fp = params.bidfloor;
+    }
     if (params.inScreen) {
       data.t = params.inScreen;
       data.pi = 2;
diff --git a/modules/gumgumBidAdapter.md b/modules/gumgumBidAdapter.md
index 14f2fe40abb..57616a90ac2 100644
--- a/modules/gumgumBidAdapter.md
+++ b/modules/gumgumBidAdapter.md
@@ -20,7 +20,8 @@ var adUnits = [
       {
         bidder: 'gumgum',
         params: {
-          inSlot: '15901' // GumGum Slot ID given to the client
+          inSlot: '15901', // GumGum Slot ID given to the client,
+          bidFloor: 0.03 // CPM bid floor
         }
       }
     ]
@@ -31,7 +32,8 @@ var adUnits = [
       {
         bidder: 'gumgum',
         params: {
-          inScreen: 'dc9d6be1' // GumGum Zone ID given to the client
+          inScreen: 'dc9d6be1', // GumGum Zone ID given to the client
+          bidFloor: 0.03 // CPM bid floor
         }
       }
     ]
diff --git a/test/spec/modules/gumgumBidAdapter_spec.js b/test/spec/modules/gumgumBidAdapter_spec.js
index 0c1431b71a5..c067f50fa56 100644
--- a/test/spec/modules/gumgumBidAdapter_spec.js
+++ b/test/spec/modules/gumgumBidAdapter_spec.js
@@ -17,7 +17,8 @@ describe('gumgumAdapter', function () {
     let bid = {
       'bidder': 'gumgum',
       'params': {
-        'inScreen': '10433394'
+        'inScreen': '10433394',
+        'bidfloor': 0.05
       },
       'adUnitCode': 'adunit-code',
       'sizes': [[300, 250], [300, 600], [1, 1]],
@@ -40,7 +41,7 @@ describe('gumgumAdapter', function () {
       expect(spec.isBidRequestValid(bid)).to.equal(true);
     });
 
-    it('should return false when required params are not passed', function () {
+    it('should return false when no unit type is specified', function () {
       let bid = Object.assign({}, bid);
       delete bid.params;
       bid.params = {
@@ -48,6 +49,16 @@ describe('gumgumAdapter', function () {
       };
       expect(spec.isBidRequestValid(bid)).to.equal(false);
     });
+
+    it('should return false when bidfloor is not a number', function () {
+      let bid = Object.assign({}, bid);
+      delete bid.params;
+      bid.params = {
+        'inSlot': '789',
+        'bidfloor': '0.50'
+      };
+      expect(spec.isBidRequestValid(bid)).to.equal(false);
+    });
   });
 
   describe('buildRequests', function () {