diff --git a/transport/http.go b/transport/http.go
index d045a1edd..432d14add 100644
--- a/transport/http.go
+++ b/transport/http.go
@@ -307,7 +307,7 @@ func (t *HTTPTransport) SendProfile(
 		for _, profileReader := range profileReaders {
 			h = make(textproto.MIMEHeader)
 			h.Set("Content-Disposition", fmt.Sprintf(`form-data; name="profile"`))
-			h.Set("Content-Type", "application/x-protobuf; messageType=”perftools.profiles.Profile")
+			h.Set("Content-Type", `application/x-protobuf; messageType="perftools.profiles.Profile"`)
 			part, err = w.CreatePart(h)
 			if err != nil {
 				return err
diff --git a/transport/http_test.go b/transport/http_test.go
index b16ceb1b1..bf2cb19ba 100644
--- a/transport/http_test.go
+++ b/transport/http_test.go
@@ -555,14 +555,14 @@ func TestHTTPTransportSendProfile(t *testing.T) {
 			formName: "profile",
 			header: makeHeader(
 				"Content-Disposition", `form-data; name="profile"`,
-				"Content-Type", "application/x-protobuf; messageType=”perftools.profiles.Profile",
+				"Content-Type", `application/x-protobuf; messageType="perftools.profiles.Profile"`,
 			),
 			content: "profile1",
 		}, {
 			formName: "profile",
 			header: makeHeader(
 				"Content-Disposition", `form-data; name="profile"`,
-				"Content-Type", "application/x-protobuf; messageType=”perftools.profiles.Profile",
+				"Content-Type", `application/x-protobuf; messageType="perftools.profiles.Profile"`,
 			),
 			content: "profile2",
 		}},