diff --git a/github-oauth/src/main/java/com/googlesource/gerrit/plugins/github/oauth/AuthenticatedLoginHttpResponse.java b/github-oauth/src/main/java/com/googlesource/gerrit/plugins/github/oauth/AuthenticatedLoginHttpResponse.java
index 5e4b586..e9bd369 100644
--- a/github-oauth/src/main/java/com/googlesource/gerrit/plugins/github/oauth/AuthenticatedLoginHttpResponse.java
+++ b/github-oauth/src/main/java/com/googlesource/gerrit/plugins/github/oauth/AuthenticatedLoginHttpResponse.java
@@ -15,6 +15,7 @@
 
 import java.io.ByteArrayOutputStream;
 import java.io.IOException;
+import java.io.OutputStreamWriter;
 import java.io.PrintWriter;
 import java.util.Collection;
 import java.util.Collections;
@@ -174,7 +175,8 @@
 
   @Override
   public PrintWriter getWriter() throws IOException {
-    return new PrintWriter(outputStream);
+    return new PrintWriter(new OutputStreamWriter(outputStream,
+        characterEncoding));
   }
 
   @Override