diff --git a/.merlin b/.merlin
index 728816da..933075fd 100644
--- a/.merlin
+++ b/.merlin
@@ -15,4 +15,4 @@ PKG benchmark
 PKG threads
 PKG threads.posix
 PKG lwt
-FLG -w +K,+Y,+X
+FLG -w +a -w -4 -w -44
diff --git a/_tags b/_tags
index e89e7e22..37a53b13 100644
--- a/_tags
+++ b/_tags
@@ -160,4 +160,4 @@
 <tests/*.ml{,i}>: thread
 <threads/*.ml{,i}>: thread
 <sequence>: -traverse
-<{string,core}/**/*.ml>: warn_K, warn_Y, warn_X
+<{string,core}/**/*.ml>: warn_A, warn(-4), warn(-44)