diff --git a/unittest/commands/test_reset_ids.cpp b/unittest/commands/test_reset_ids.cpp
index 8ca5fe5c05..1506f9a892 100644
--- a/unittest/commands/test_reset_ids.cpp
+++ b/unittest/commands/test_reset_ids.cpp
@@ -46,8 +46,8 @@ protected:
         LAMMPSTest::SetUp();
         if (info->has_style("atom", "full")) {
             BEGIN_HIDE_OUTPUT();
-            command("variable input_dir index " STRINGIFY(TEST_INPUT_FOLDER));
-            command("include ${input_dir}/in.fourmol");
+            command("variable input_dir index \"" STRINGIFY(TEST_INPUT_FOLDER) "\"");
+            command("include \"${input_dir}/in.fourmol\"");
             END_HIDE_OUTPUT();
         }
     }