diff --git a/pkgs/development/tools/delve/default.nix b/pkgs/development/tools/delve/default.nix
index 2d2eecd5412..9a0d19840e4 100644
--- a/pkgs/development/tools/delve/default.nix
+++ b/pkgs/development/tools/delve/default.nix
@@ -21,7 +21,7 @@ buildGoPackage rec {
   postInstall = ''
     # fortify source breaks build since delve compiles with -O0
     wrapProgram $out/bin/dlv \
-      --set "disableHardening" fortify
+      --prefix disableHardening " " fortify
   '';
 
   meta = with lib; {