diff --git a/src/parallel_io.c b/src/parallel_io.c
index e7c877b2d8bb19ab7bfde13d41a0f5e3f7f0176d..270e97170ad7a54a892cee2b7260bfeea48b5864 100644
--- a/src/parallel_io.c
+++ b/src/parallel_io.c
@@ -981,8 +981,7 @@ void read_ic_parallel(char* fileName, const struct unit_system* internal_units,
         if (with_hydro) {
           Nparticles = *Ngas;
           hydro_read_particles(*parts, list, &num_fields);
-          num_fields += chemistry_read_particles(*parts, list + num_fields,
-                                                 with_cosmology);
+          num_fields += chemistry_read_particles(*parts, list + num_fields);
         }
         break;