diff --git a/adapters/pubmatic/pubmatic.go b/adapters/pubmatic/pubmatic.go
index a4c4e222210..2dfba673734 100644
--- a/adapters/pubmatic/pubmatic.go
+++ b/adapters/pubmatic/pubmatic.go
@@ -471,7 +471,7 @@ func parseImpressionObject(imp *openrtb.Imp, wrapExt *string, pubID *string) err
 	}
 
 	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 8ed2ccd391c..21eb56806de 100644
--- a/adapters/pubmatic/pubmatic_test.go
+++ b/adapters/pubmatic/pubmatic_test.go
@@ -20,6 +20,8 @@ import (
 	"github.com/prebid/prebid-server/openrtb_ext"
 	"github.com/prebid/prebid-server/pbs"
 	"github.com/prebid/prebid-server/usersync"
+
+	"github.com/stretchr/testify/assert"
 )
 
 func TestJsonSamples(t *testing.T) {
@@ -728,3 +730,36 @@ func TestGetBidTypeForUnsupportedCode(t *testing.T) {
 		t.Errorf("Expected Bid Type value was: %v, actual value is: %v", openrtb_ext.BidTypeBanner, actualBidTypeValue)
 	}
 }
+
+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, "5890", updatedPubID, "Publisher.ID field should be trimmed")
+}
\ No newline at end of file