diff --git a/flake.nix b/flake.nix
index 842c16a07..261f52853 100644
--- a/flake.nix
+++ b/flake.nix
@@ -245,7 +245,7 @@
       vivado = pkgs.buildFHSUserEnv {
         name = "vivado";
         targetPkgs = vivadoDeps;
-        profile = "source /opt/Xilinx/Vivado/2021.1/settings64.sh";
+        profile = "set -e; source /opt/Xilinx/Vivado/2021.1/settings64.sh";
         runScript = "vivado";
       };