diff --git a/modules/eplanningBidAdapter.js b/modules/eplanningBidAdapter.js
index dfc5f514cf3..6ead42d4b2d 100644
--- a/modules/eplanningBidAdapter.js
+++ b/modules/eplanningBidAdapter.js
@@ -17,6 +17,7 @@ export const spec = {
   isBidRequestValid: function(bid) {
     return Boolean(bid.params.ci) || Boolean(bid.params.t);
   },
+
   buildRequests: function(bidRequests) {
     const method = 'GET';
     const dfpClientId = '1';
@@ -24,6 +25,7 @@ export const spec = {
     let url;
     let params;
     const urlConfig = getUrlConfig(bidRequests);
+    const pcrs = getCharset();
 
     if (urlConfig.t) {
       url = urlConfig.isv + '/layers/t_pbjs_2.json';
@@ -40,6 +42,11 @@ export const spec = {
         pbv: '$prebid.version$',
         ncb: '1'
       };
+
+      if (pcrs) {
+        params.crs = pcrs;
+      }
+
       if (referrerUrl) {
         params.fr = referrerUrl;
       }
@@ -147,6 +154,15 @@ function getSpacesString(bids) {
 
   return spacesString;
 }
+
+function getCharset() {
+  try {
+    return window.top.document.charset || window.top.document.characterSet;
+  } catch (e) {
+    return document.charset || document.characterSet;
+  }
+}
+
 function getBidIdMap(bidRequests) {
   let map = {};
   bidRequests.forEach(bid => map[cleanName(bid.adUnitCode)] = bid.bidId);
diff --git a/test/spec/modules/eplanningBidAdapter_spec.js b/test/spec/modules/eplanningBidAdapter_spec.js
index 68b9e1b263f..a56bff42285 100644
--- a/test/spec/modules/eplanningBidAdapter_spec.js
+++ b/test/spec/modules/eplanningBidAdapter_spec.js
@@ -259,6 +259,19 @@ describe('E-Planning Adapter', () => {
       stubGetReferrer.restore()
     });
 
+    it('should return crs parameter with document charset', () => {
+      let expected;
+      try {
+        expected = window.top.document.characterSet;
+      } catch (e) {
+        expected = document.characterSet;
+      }
+
+      const chset = spec.buildRequests(bidRequests).data.crs;
+
+      expect(chset).to.equal(expected);
+    });
+
     it('should return the testing url when the request has the t parameter', () => {
       const url = spec.buildRequests([testBid]).url;
       const expectedUrl = '//' + TEST_ISV + '/layers/t_pbjs_2.json';