diff --git a/tests/nix-shell.sh b/tests/nix-shell.sh
index 2ed40068a..650904057 100644
--- a/tests/nix-shell.sh
+++ b/tests/nix-shell.sh
@@ -57,7 +57,7 @@ output=$($TEST_ROOT/shell.shebang.rb abc ruby)
 [ "$output" = '-e load("'"$TEST_ROOT"'/shell.shebang.rb") -- abc ruby' ]
 
 # Test 'nix develop'.
-nix develop -f shell.nix shellDrv -c sh -c '[[ -n $stdenv ]]'
+nix develop -f shell.nix shellDrv -c bash -c '[[ -n $stdenv ]]'
 
 # Test 'nix print-dev-env'.
 source <(nix print-dev-env -f shell.nix shellDrv)