diff --git a/pkgs/development/python-modules/langchain-mistralai/default.nix b/pkgs/development/python-modules/langchain-mistralai/default.nix
index 3bd64f3fa7d8..6cc5a0baeec6 100644
--- a/pkgs/development/python-modules/langchain-mistralai/default.nix
+++ b/pkgs/development/python-modules/langchain-mistralai/default.nix
@@ -63,7 +63,7 @@ buildPythonPackage rec {
   pythonImportsCheck = [ "langchain_mistralai" ];
 
   passthru.updateScript = gitUpdater {
-    pname = "langchain-mistralai==";
+    rev-prefix = "langchain-mistralai==";
   };
 
   meta = {