diff --git a/binding/format/protobuf/v2/protobuf.go b/binding/format/protobuf/v2/protobuf.go
index e29dabab..2e76773e 100644
--- a/binding/format/protobuf/v2/protobuf.go
+++ b/binding/format/protobuf/v2/protobuf.go
@@ -88,7 +88,12 @@ func ToProto(e *event.Event) (*pb.CloudEvent, error) {
 		container.Attributes[datacontenttype], _ = attributeFor(e.DataContentType())
 	}
 	if e.DataSchema() != "" {
-		container.Attributes[dataschema], _ = attributeFor(e.DataSchema())
+		dataSchemaStr := e.DataSchema()
+		uri, err := url.Parse(dataSchemaStr)
+		if err != nil {
+			return nil, fmt.Errorf("failed to url.Parse %s: %s", dataSchemaStr, err)
+		}
+		container.Attributes[dataschema], _ = attributeFor(uri)
 	}
 	if e.Subject() != "" {
 		container.Attributes[subject], _ = attributeFor(e.Subject())
@@ -251,8 +256,8 @@ func FromProto(container *pb.CloudEvent) (*event.Event, error) {
 			vs, _ := v.(string)
 			e.SetDataContentType(vs)
 		case dataschema:
-			vs, _ := v.(string)
-			e.SetDataSchema(vs)
+			vs, _ := v.(types.URI)
+			e.SetDataSchema(vs.String())
 		case subject:
 			vs, _ := v.(string)
 			e.SetSubject(vs)
diff --git a/binding/format/protobuf/v2/protobuf_test.go b/binding/format/protobuf/v2/protobuf_test.go
index 3b76ae3e..0c7dbf87 100644
--- a/binding/format/protobuf/v2/protobuf_test.go
+++ b/binding/format/protobuf/v2/protobuf_test.go
@@ -109,6 +109,7 @@ func TestFromProto(t *testing.T) {
 			Type:        "some.type",
 			Attributes: map[string]*pb.CloudEventAttributeValue{
 				"datacontenttype": {Attr: &pb.CloudEventAttributeValue_CeString{CeString: "application/json"}},
+				"dataschema":      {Attr: &pb.CloudEventAttributeValue_CeUri{CeUri: "link"}},
 				"extra1":          {Attr: &pb.CloudEventAttributeValue_CeString{CeString: "extra1 value"}},
 				"extra2":          {Attr: &pb.CloudEventAttributeValue_CeInteger{CeInteger: 2}},
 				"extra3":          {Attr: &pb.CloudEventAttributeValue_CeBoolean{CeBoolean: true}},
@@ -124,6 +125,7 @@ func TestFromProto(t *testing.T) {
 			out.SetSource("/source")
 			out.SetType("some.type")
 			_ = out.SetData("application/json", map[string]interface{}{"unit": "test"})
+			out.SetDataSchema("link")
 			out.SetExtension("extra1", "extra1 value")
 			out.SetExtension("extra2", 2)
 			out.SetExtension("extra3", true)
@@ -140,6 +142,7 @@ func TestFromProto(t *testing.T) {
 			Type:        "some.type",
 			Attributes: map[string]*pb.CloudEventAttributeValue{
 				"datacontenttype": {Attr: &pb.CloudEventAttributeValue_CeString{CeString: "text/plain"}},
+				"dataschema":      {Attr: &pb.CloudEventAttributeValue_CeUri{CeUri: "link"}},
 				"extra1":          {Attr: &pb.CloudEventAttributeValue_CeString{CeString: "extra1 value"}},
 				"extra2":          {Attr: &pb.CloudEventAttributeValue_CeInteger{CeInteger: 2}},
 				"extra3":          {Attr: &pb.CloudEventAttributeValue_CeBoolean{CeBoolean: true}},
@@ -155,6 +158,7 @@ func TestFromProto(t *testing.T) {
 			out.SetSource("/source")
 			out.SetType("some.type")
 			_ = out.SetData("text/plain", `this is some text with a "quote"`)
+			out.SetDataSchema("link")
 			out.SetExtension("extra1", "extra1 value")
 			out.SetExtension("extra2", 2)
 			out.SetExtension("extra3", true)
@@ -171,6 +175,7 @@ func TestFromProto(t *testing.T) {
 			Type:        "some.type",
 			Attributes: map[string]*pb.CloudEventAttributeValue{
 				"datacontenttype": {Attr: &pb.CloudEventAttributeValue_CeString{CeString: "application/json"}},
+				"dataschema":      {Attr: &pb.CloudEventAttributeValue_CeUri{CeUri: "link"}},
 				"extra1":          {Attr: &pb.CloudEventAttributeValue_CeString{CeString: "extra1 value"}},
 				"extra2":          {Attr: &pb.CloudEventAttributeValue_CeInteger{CeInteger: 2}},
 				"extra3":          {Attr: &pb.CloudEventAttributeValue_CeBoolean{CeBoolean: true}},
@@ -186,6 +191,7 @@ func TestFromProto(t *testing.T) {
 			out.SetSource("/source")
 			out.SetType("some.type")
 			_ = out.SetData("application/json", `{"unit":"test"}`)
+			out.SetDataSchema("link")
 			out.SetExtension("extra1", "extra1 value")
 			out.SetExtension("extra2", 2)
 			out.SetExtension("extra3", true)