diff --git a/pkgs/by-name/is/istioctl/package.nix b/pkgs/by-name/is/istioctl/package.nix
index 57cd93d232d2..73323b9e8595 100644
--- a/pkgs/by-name/is/istioctl/package.nix
+++ b/pkgs/by-name/is/istioctl/package.nix
@@ -32,8 +32,8 @@ buildGoModule rec {
     [
       "-s"
       "-w"
-      "${lib.concatMapStringsSep " " (attr: "-X ${attr}") attrs}"
-    ];
+    ]
+    ++ map (attr: "-X ${attr}") attrs;
 
   subPackages = [ "istioctl/cmd/istioctl" ];