diff --git a/pkgs/build-support/go/module.nix b/pkgs/build-support/go/module.nix
index 69a6121722d5..b9722cc413a6 100644
--- a/pkgs/build-support/go/module.nix
+++ b/pkgs/build-support/go/module.nix
@@ -320,10 +320,15 @@ lib.extendMkDerivation {
               }
 
               getGoDirs() {
-                local type;
-                type="$1"
-                if [ -n "$subPackages" ]; then
-                  echo "$subPackages" | sed "s,\(^\| \),\1./,g"
+                local -r type="$1"
+
+                # Support strucuredAttrs, they are not space seperated
+                local -a subPackagesArray
+                concatTo subPackagesArray subPackages
+
+                # Outputs each element prefixed with './' if the array is not empty
+                if [[ ''${#subPackagesArray[@]} -gt 0 ]]; then
+                  echo "''${subPackagesArray[*]/#/./}"
                 else
                   find . -type f -name \*$type.go -exec dirname {} \; | grep -v "/vendor/" | sort --unique | grep -v "$exclude"
                 fi
diff --git a/pkgs/by-name/ne/neo-cowsay/package.nix b/pkgs/by-name/ne/neo-cowsay/package.nix
index efcb0d4c60b8..209951938481 100644
--- a/pkgs/by-name/ne/neo-cowsay/package.nix
+++ b/pkgs/by-name/ne/neo-cowsay/package.nix
@@ -15,6 +15,7 @@ buildGoModule (finalAttrs: {
     hash = "sha256-DmIjqBTIzwkQ8aJ6xCgIwjDtczlTH5AKbPKFUGx3qQ8=";
   };
 
+  __structuredAttrs = true;
   vendorHash = "sha256-gBURmodXkod4fukw6LWEY+MBxPcf4vn/f6K78UR77n0=";
 
   modRoot = "./cmd";