diff --git a/flake.nix b/flake.nix
index f72fa23f..aeb2e905 100644
--- a/flake.nix
+++ b/flake.nix
@@ -26,6 +26,7 @@
     {
       devShells.default = pkgs.mkShell {
         buildInputs = with pkgs; [
+          bashInteractive
           cargo-deny
           cargo-llvm-cov
           cargo-machete
diff --git a/scripts/dkg-runner/run.sh b/scripts/dkg-runner/run.sh
index 5c2729ec..e3f62a78 100755
--- a/scripts/dkg-runner/run.sh
+++ b/scripts/dkg-runner/run.sh
@@ -73,6 +73,11 @@ if ! command -v jq >/dev/null 2>&1; then
     exit 1
 fi
 
+if ! type -t compgen >/dev/null 2>&1; then
+    log_err "compgen builtin is required (bash must be built with programmable completion)"
+    exit 1
+fi
+
 if is_truthy "${RUN_SMOKE_VERIFY}" && ! command -v curl >/dev/null 2>&1; then
     log_err "curl is required for runtime smoke verification"
     exit 1