diff --git a/adapters/pubmatic/pubmatic.go b/adapters/pubmatic/pubmatic.go
index 3f1a8353f9e..6a16b24b545 100644
--- a/adapters/pubmatic/pubmatic.go
+++ b/adapters/pubmatic/pubmatic.go
@@ -592,7 +592,7 @@ func parseImpressionObject(imp *openrtb.Imp, wrapExt *pubmaticWrapperExt, pubID
 	}
 
 	if *pubID == "" {
-		*pubID = pubmaticExt.PublisherId
+		*pubID = strings.TrimSpace(pubmaticExt.PublisherId)
 	}
 
 	// Parse Wrapper Extension only once per request
diff --git a/adapters/pubmatic/pubmatic_test.go b/adapters/pubmatic/pubmatic_test.go
index 3c88b04b83d..62e1132b8c4 100644
--- a/adapters/pubmatic/pubmatic_test.go
+++ b/adapters/pubmatic/pubmatic_test.go
@@ -5,6 +5,7 @@ import (
 	"context"
 	"encoding/json"
 	"fmt"
+	"github.com/magiconair/properties/assert"
 	"io/ioutil"
 	"math/rand"
 	"net/http"
@@ -791,3 +792,36 @@ func TestCopySBExtToBidExtWithNoSeatExt(t *testing.T) {
 		t.Errorf("it should not be nil")
 	}
 }
+
+func TestMakeRequestsTrimsPubID(t *testing.T) {
+	var a PubmaticAdapter
+	a.URI = "http://test.com/openrtb2"
+
+	var bidderExt adapters.ExtImpBidder
+	extImpPubMatic := openrtb_ext.ExtImpPubmatic{}
+	extImpPubMatic.PublisherId = " 5890 "
+	bidderExt.Bidder, _ = json.Marshal(extImpPubMatic)
+	extRaw, _ := json.Marshal(bidderExt)
+
+	var w, h uint64
+	w = 300
+	h = 250
+	var impression = openrtb.Imp{
+		Banner: &openrtb.Banner{
+			W: &w,
+			H: &h,
+		},
+		Ext: extRaw,
+	}
+	request := &openrtb.BidRequest{
+		Imp: []openrtb.Imp{impression},
+		Site: &openrtb.Site{
+			Publisher: &openrtb.Publisher{},
+		},
+	}
+	a.MakeRequests(request, nil)
+
+	updatedPubID := request.Site.Publisher.ID
+
+	assert.Equal(t, updatedPubID, "5890", "Publisher.ID field should be trimmed")
+}