diff --git a/ci/shell.nix b/ci/shell.nix
index 2993a86f73..eaa0fb0ad6 100644
--- a/ci/shell.nix
+++ b/ci/shell.nix
@@ -80,6 +80,7 @@ stdenvNoCC.mkDerivation ({
     SDL2
     SDL2_image
     bash
+    bloaty  # for binsize
     check
     curl  # for connect tests
     editorconfig-checker