diff --git a/Gopkg.lock b/Gopkg.lock
index c77e0692..6bf5e157 100644
--- a/Gopkg.lock
+++ b/Gopkg.lock
@@ -170,7 +170,7 @@
   revision = "abc90934186a77966e2beeac62ed966aac0561d5"
 
 [[projects]]
-  branch = "master"
+  branch = "v1.2.0"
   name = "github.com/satori/go.uuid"
   packages = ["."]
   revision = "f58768cc1a7a7e77a3bd49e98cdd21419399b6a3"
diff --git a/context/gzip_response_writer.go b/context/gzip_response_writer.go
index 05ee0c65..c9582f99 100644
--- a/context/gzip_response_writer.go
+++ b/context/gzip_response_writer.go
@@ -117,7 +117,9 @@ func (w *GzipResponseWriter) Write(contents []byte) (int, error) {
 func (w *GzipResponseWriter) Writef(format string, a ...interface{}) (n int, err error) {
 	n, err = fmt.Fprintf(w, format, a...)
 	if err == nil {
-		w.ResponseWriter.Header().Set(contentTypeHeaderKey, ContentTextHeaderValue)
+		if w.ResponseWriter.Header()[contentTypeHeaderKey] == nil {
+			w.ResponseWriter.Header().Set(contentTypeHeaderKey, ContentTextHeaderValue)
+		}
 	}
 
 	return
@@ -128,7 +130,10 @@ func (w *GzipResponseWriter) Writef(format string, a ...interface{}) (n int, err
 func (w *GzipResponseWriter) WriteString(s string) (n int, err error) {
 	n, err = w.Write([]byte(s))
 	if err == nil {
-		w.ResponseWriter.Header().Set(contentTypeHeaderKey, ContentTextHeaderValue)
+		if w.ResponseWriter.Header()[contentTypeHeaderKey] == nil {
+			w.ResponseWriter.Header().Set(contentTypeHeaderKey, ContentTextHeaderValue)
+		}
+
 	}
 	return
 }