diff --git a/src/turbonss-unix2db.zig b/src/turbonss-unix2db.zig
index cd5c9fc..cbf8d02 100644
--- a/src/turbonss-unix2db.zig
+++ b/src/turbonss-unix2db.zig
@@ -148,7 +148,12 @@ test "turbonss-unix2db invalid argument" {
 
 test "turbonss-unix2db trivial error: missing passwd file" {
     const allocator = testing.allocator;
-    const args = &[_][*:0]const u8{};
+    const args = &[_][*:0]const u8{
+        "--passwd",
+        "/does/not/exist/passwd",
+        "--group",
+        "/does/not/exist/group",
+    };
     var stderr = ArrayList(u8).init(allocator);
     defer stderr.deinit();
     var stdout = ArrayList(u8).init(allocator);
@@ -156,7 +161,7 @@ test "turbonss-unix2db trivial error: missing passwd file" {
 
     const exit_code = execute(allocator, stdout.writer(), stderr.writer(), args[0..]);
     try testing.expectEqual(@as(u8, 1), exit_code);
-    try testing.expectEqualStrings(stderr.items, "ERROR FileNotFound: open 'passwd'\n");
+    try testing.expectEqualStrings(stderr.items, "ERROR FileNotFound: open '/does/not/exist/passwd'\n");
 }
 
 test "turbonss-unix2db fail" {