diff --git a/package/sentinèlla/default.nix b/package/sentinèlla/default.nix
index 8f23bd0..184cddd 100644
--- a/package/sentinèlla/default.nix
+++ b/package/sentinèlla/default.nix
@@ -16,8 +16,10 @@ let
   probe = hectic.writeShellApplication {
     inherit shell bashOptions;
     name = "probe";
-    runtimeInputs = [ socat dash router ];
-    text = builtins.readFile ./probe.sh;
+    runtimeInputs = [ socat ];
+    text = ''
+      socat -T5 -t5 TCP-LISTEN:"''${PORT:-5988}",reuseaddr,fork EXEC:"${router}/bin/router",pipes
+    '';
   };
 
   router = hectic.writeShellApplication {
diff --git a/package/sentinèlla/probe.sh b/package/sentinèlla/probe.sh
index 32d0294..d81ff17 100644
--- a/package/sentinèlla/probe.sh
+++ b/package/sentinèlla/probe.sh
@@ -1,6 +1,3 @@
 #!/bin/dash
 
-socat -V >/dev/null
-dash -c 'echo ok' >/dev/null
-
 socat -T5 -t5 TCP-LISTEN:"${PORT:-5988}",reuseaddr,fork EXEC:"router"