diff --git a/pkgs/default.nix b/pkgs/default.nix
index 77bcfde6..9f97c464 100644
--- a/pkgs/default.nix
+++ b/pkgs/default.nix
@@ -59,15 +59,15 @@ pkgs {
       });
 
       fractalide-tests = let
-        # parallel cannot quite handle full inline bash, and destroys quoting, so we can't use bash -c
 
+        # parallel cannot quite handle full inline bash, and destroys quoting, so we can't use bash -c
         racoTest = builtins.toFile "raco-test.sh" ''
           racket -l- raco test "$@" |&
             grep -v -e "warning: tool .* registered twice" -e "@[(]test-responsible"
           exit ''${PIPESTATUS[0]}
         '';
       in self.runCommand "fractalide-tests" {
-        buildInputs = [ fractalide-tests-pkg.env self.parallel ];
+        buildInputs = [ fractalide-tests-pkg.env self.parallel self.time ];
         inherit racoTest;
       } ''
         # If we do raco test <directory> the discovery process will try to mkdir $HOME.
@@ -76,10 +76,14 @@ pkgs {
 
         find ${fractalide-tests-pkg.env}/share/racket/pkgs/*/modules/rkt/rkt-fbp/agents \
           '(' -name gui -prune ')' -o '(' -name '*.rkt' -print ')' |
-          parallel -n 1 -j ''${NIX_BUILD_CORES:-1} bash $racoTest |
+          time -p parallel -n 1 -j ''${NIX_BUILD_CORES:-1} bash $racoTest |
           tee $out
         exit ''${PIPESTATUS[1]}
       '';
+
+      fractalide-tests-flat = fractalide-tests.overrideAttrs (oldAttrs: {
+        buildInputs = [ (fractalide.override { flat = true; }).env self.parallel self.time ];
+      });
     })
   ];
 }