diff --git a/shell.nix b/shell.nix
index de94ed5..bd0e4bf 100644
--- a/shell.nix
+++ b/shell.nix
@@ -57,7 +57,7 @@ let
     RUSTFLAGS = "-D warnings";
     LOCALE_ARCHIVE_2_21 = "${oldpkgs.glibcLocales}/lib/locale/locale-archive";
     LOCALE_ARCHIVE_2_27 = "${pkgs.glibcLocales}/lib/locale/locale-archive";
-
+    RUST_BACKTRACE = "1";
     passthru.phpEnv = phpEnv;
   };