diff --git a/pkgs/development/python-modules/flashinfer/default.nix b/pkgs/development/python-modules/flashinfer/default.nix
index ee255c57336c..99da58ba8f87 100644
--- a/pkgs/development/python-modules/flashinfer/default.nix
+++ b/pkgs/development/python-modules/flashinfer/default.nix
@@ -77,7 +77,7 @@ buildPythonPackage {
   '';
 
   CUDA_HOME = "${cudaPackages.cudatoolkit}";
-  TORCH_CUDA_ARCH_LIST = "${lib.concatStringsSep ";" torch.cudaCapabilities}";
+  TORCH_CUDA_ARCH_LIST = lib.concatStringsSep ";" torch.cudaCapabilities;
 
   dependencies = [
     numpy