1 files changed, 2 insertions, 1 deletions
diff --git a/jetty-server/src/test/java/org/eclipse/jetty/server/handler/AbstractConnectHandlerTest.java b/jetty-server/src/test/java/org/eclipse/jetty/server/handler/AbstractConnectHandlerTest.java
index 1711fccce5..a597e7b801 100644
--- a/jetty-server/src/test/java/org/eclipse/jetty/server/handler/AbstractConnectHandlerTest.java
+++ b/jetty-server/src/test/java/org/eclipse/jetty/server/handler/AbstractConnectHandlerTest.java
@@ -24,6 +24,7 @@ import java.io.IOException;
 import java.net.Socket;
 import java.net.SocketTimeoutException;
 import java.util.LinkedHashMap;
+import java.util.Locale;
 import java.util.Map;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
@@ -104,7 +105,7 @@ public abstract class AbstractConnectHandlerTest
             assertTrue(header.lookingAt());
             String headerName = header.group(1);
             String headerValue = header.group(2);
-            headers.put(headerName.toLowerCase(), headerValue.toLowerCase());
+            headers.put(headerName.toLowerCase(Locale.ENGLISH), headerValue.toLowerCase(Locale.ENGLISH));
         }
 
         StringBuilder body;