diff --git a/packages/sabnzbd-mcp/package.nix b/packages/sabnzbd-mcp/package.nix
index 68fe310..dc0a562 100644
--- a/packages/sabnzbd-mcp/package.nix
+++ b/packages/sabnzbd-mcp/package.nix
@@ -29,6 +29,14 @@ stdenv.mkDerivation {
 
   nativeBuildInputs = [ makeWrapper ];
 
+  postPatch = ''
+    # The upstream client hardcodes /sabnzbd/api as the API path.
+    # Change to just /api so SABNZBD_URL can optionally include the path prefix
+    # (e.g. http://host:9092/sabnzbd or just http://host:9092).
+    substituteInPlace client.py \
+      --replace-fail '"{self.base_url}/sabnzbd/api"' '"{self.base_url}/api"'
+  '';
+
   installPhase = ''
     mkdir -p $out/lib/sabnzbd-mcp
     cp sabnzbd-mcp-server.py client.py $out/lib/sabnzbd-mcp/