diff --git a/package.nix b/package.nix
index fdc9992..4e48c8e 100644
--- a/package.nix
+++ b/package.nix
@@ -23,7 +23,8 @@ stdenv.mkDerivation rec {
 
     # Wrap to ensure babashka is on PATH
     wrapProgram $out/bin/brepl \
-      --prefix PATH : ${lib.makeBinPath [ babashka ]}
+      --prefix PATH : ${lib.makeBinPath [ babashka ]} \
+      --set BABASHKA_CLASSPATH ""
 
     runHook postInstall
   '';
@@ -45,4 +46,4 @@ stdenv.mkDerivation rec {
     platforms = babashka.meta.platforms;
     mainProgram = "brepl";
   };
-}
\ No newline at end of file
+}