diff --git a/codec-http/src/main/java/io/netty/handler/codec/http/websocketx/WebSocketUtil.java b/codec-http/src/main/java/io/netty/handler/codec/http/websocketx/WebSocketUtil.java
index 4e1de6a1db..c4d2cbefaf 100644
--- a/codec-http/src/main/java/io/netty/handler/codec/http/websocketx/WebSocketUtil.java
+++ b/codec-http/src/main/java/io/netty/handler/codec/http/websocketx/WebSocketUtil.java
@@ -27,6 +27,8 @@ import java.util.concurrent.ThreadLocalRandom;
  */
 final class WebSocketUtil {
 
+    // Suppress a warning about weak hash algorithm since it's defined in draft-ietf-hybi-thewebsocketprotocol-00
+    @SuppressWarnings("lgtm[java/weak-cryptographic-algorithm]")
     private static final FastThreadLocal<MessageDigest> MD5 = new FastThreadLocal<MessageDigest>() {
         @Override
         protected MessageDigest initialValue() throws Exception {
@@ -40,6 +42,8 @@ final class WebSocketUtil {
         }
     };
 
+    // Suppress a warning about weak hash algorithm since it's defined in draft-ietf-hybi-thewebsocketprotocol-00
+    @SuppressWarnings("lgtm[java/weak-cryptographic-algorithm]")
     private static final FastThreadLocal<MessageDigest> SHA1 = new FastThreadLocal<MessageDigest>() {
         @Override
         protected MessageDigest initialValue() throws Exception {