diff --git a/artiq/windows/run-test.nix b/artiq/windows/run-test.nix
index fe89ca8..4988d16 100644
--- a/artiq/windows/run-test.nix
+++ b/artiq/windows/run-test.nix
@@ -36,6 +36,7 @@ stdenv.mkDerivation {
   installPhase = ''
     mkdir -p $out/bin
     cat > $out/bin/run.sh << EOF
+    #!/usr/bin/env bash
     set -e -m
 
     # +1 day from last modification of the disk image