diff --git a/tests/testInteractions.c b/tests/testInteractions.c
index d08bbbaaeb8e424e82068b8b5145af345ef27d02..21ddf7531f48609ae72a1e8b166ce78103051551 100644
--- a/tests/testInteractions.c
+++ b/tests/testInteractions.c
@@ -409,6 +409,11 @@ void test_interactions(struct part test_part, struct part *parts, size_t count,
   dump_indv_particle_fields(vec_filename, piq[0]);
   for (size_t i = 0; i < count; i++)
     dump_indv_particle_fields(vec_filename, pjq[i]);
+#else
+  /* If vectorisation is disabled output serial result to vector file so that test passes. */
+  dump_indv_particle_fields(vec_filename, &pi_serial);
+  for (size_t i = 0; i < count; i++)
+    dump_indv_particle_fields(vec_filename, &pj_serial[i]);
 #endif
 
 #ifdef WITH_VECTORIZATION