diff --git a/pkgs/by-name/py/pyrefly/package.nix b/pkgs/by-name/py/pyrefly/package.nix
index 41c354c1b52b..46207680f2df 100644
--- a/pkgs/by-name/py/pyrefly/package.nix
+++ b/pkgs/by-name/py/pyrefly/package.nix
@@ -23,6 +23,7 @@ rustPlatform.buildRustPackage (finalAttrs: {
   buildInputs = [ rust-jemalloc-sys ];
 
   nativeInstallCheckInputs = [ versionCheckHook ];
+  versionCheckProgramArg = "--version";
   doInstallCheck = true;
 
   # redirect tests writing to /tmp