diff --git a/contrib/pyln-testing/pyln/testing/utils.py b/contrib/pyln-testing/pyln/testing/utils.py
index 16fa126b3..2d28535ef 100644
--- a/contrib/pyln-testing/pyln/testing/utils.py
+++ b/contrib/pyln-testing/pyln/testing/utils.py
@@ -598,7 +598,7 @@ class LightningD(TailableProc):
         self.disconnect_file = None
 
         self.rpcproxy = bitcoindproxy
-        self.env['CLN_PLUGIN_LOG'] = "gl_plugin=trace,gl_rpc=trace,gl_grpc=trace,debug"
+        self.env['CLN_PLUGIN_LOG'] = "cln_plugin=trace,cln_rpc=trace,cln_grpc=trace,debug"
 
         self.opts = LIGHTNINGD_CONFIG.copy()
         opts = {