diff --git a/src/hydro/Gadget2/hydro.h b/src/hydro/Gadget2/hydro.h
index 7598f7b454bcda45c51c6090e97dd6843e9bb147..8b81f6e8e8c79d9a3904d3263da01c3f9877149f 100644
--- a/src/hydro/Gadget2/hydro.h
+++ b/src/hydro/Gadget2/hydro.h
@@ -76,13 +76,24 @@ __attribute__((always_inline)) INLINE static float hydro_get_pressure(
   return gas_pressure_from_entropy(p->rho, p->entropy);
 }
 
+/**
+ * @brief Returns the comoving entropy of a particle
+ *
+ * @param p The particle of interest.
+ */
+__attribute__((always_inline)) INLINE static float hydro_get_comoving_entropy(
+    const struct part *restrict p) {
+
+  return p->entropy;
+}
+
 /**
  * @brief Returns the entropy of a particle
  *
  * @param p The particle of interest.
  * @param cosmo The cosmological model.
  */
-__attribute__((always_inline)) INLINE static float hydro_get_entropy(
+__attribute__((always_inline)) INLINE static float hydro_get_physical_entropy(
     const struct part *restrict p, const struct cosmology *cosmo) {
 
   return p->entropy;
diff --git a/src/statistics.c b/src/statistics.c
index 66b0308f69deab84411d7647168537837d55305e..7223ffd9cd463205b6d97d28f7e095b1061a9de5 100644
--- a/src/statistics.c
+++ b/src/statistics.c
@@ -164,7 +164,7 @@ void stats_collect_part_mapper(void *map_data, int nr_parts, void *extra_data) {
     hydro_get_drifted_velocities(p, xp, dt_kick_hydro, dt_kick_grav, v);
     const double x[3] = {p->x[0], p->x[1], p->x[2]};
     const float m = hydro_get_mass(p);
-    const float entropy = hydro_get_entropy(p, cosmo);
+    const float entropy = hydro_get_physical_entropy(p, cosmo);
     const float u_int = hydro_get_physical_internal_energy(p, cosmo);
 
     /* Collect mass */
diff --git a/tests/test125cells.c b/tests/test125cells.c
index 6df500f05c254ed9b6686956dce1a07588318e35..efaf4f168585953233ebd7401142b44a43823cce 100644
--- a/tests/test125cells.c
+++ b/tests/test125cells.c
@@ -403,14 +403,14 @@ void dump_particle_fields(char *fileName, struct cell *main_cell,
             main_cell->parts[pid].x[1], main_cell->parts[pid].x[2],
             main_cell->parts[pid].v[0], main_cell->parts[pid].v[1],
             main_cell->parts[pid].v[2], main_cell->parts[pid].h,
-            hydro_get_density(&main_cell->parts[pid]),
+            hydro_get_comoving_density(&main_cell->parts[pid]),
 #if defined(MINIMAL_SPH) || defined(SHADOWFAX_SPH)
             0.f,
 #else
             main_cell->parts[pid].density.div_v,
 #endif
-            hydro_get_entropy(&main_cell->parts[pid]),
-            hydro_get_internal_energy(&main_cell->parts[pid]),
+            hydro_get_comoving_entropy(&main_cell->parts[pid]),
+            hydro_get_comoving_internal_energy(&main_cell->parts[pid]),
             hydro_get_pressure(&main_cell->parts[pid]),
             hydro_get_soundspeed(&main_cell->parts[pid]),
             main_cell->parts[pid].a_hydro[0], main_cell->parts[pid].a_hydro[1],
diff --git a/tests/test27cells.c b/tests/test27cells.c
index 85d2709dad1de4e5f5502ace092a9cb18f36a4c5..88c20294eeb571d9e74101b8594d99cfdcf1b63a 100644
--- a/tests/test27cells.c
+++ b/tests/test27cells.c
@@ -260,7 +260,7 @@ void dump_particle_fields(char *fileName, struct cell *main_cell,
             main_cell->parts[pid].x[1], main_cell->parts[pid].x[2],
             main_cell->parts[pid].v[0], main_cell->parts[pid].v[1],
             main_cell->parts[pid].v[2],
-            hydro_get_density(&main_cell->parts[pid]),
+            hydro_get_comoving_density(&main_cell->parts[pid]),
 #if defined(GIZMO_SPH) || defined(SHADOWFAX_SPH)
             0.f,
 #else
@@ -297,7 +297,7 @@ void dump_particle_fields(char *fileName, struct cell *main_cell,
               "%13e %13e %13e\n",
               cj->parts[pjd].id, cj->parts[pjd].x[0], cj->parts[pjd].x[1],
               cj->parts[pjd].x[2], cj->parts[pjd].v[0], cj->parts[pjd].v[1],
-              cj->parts[pjd].v[2], hydro_get_density(&cj->parts[pjd]),
+              cj->parts[pjd].v[2], hydro_get_comoving_density(&cj->parts[pjd]),
 #if defined(GIZMO_SPH) || defined(SHADOWFAX_SPH)
               0.f,
 #else
diff --git a/tests/testInteractions.c b/tests/testInteractions.c
index 76ee5078819882c38e3e57ac33bc4ee3ae6fc67e..d7ef9eb0a35dc3446827f16acd57ce658294a709 100644
--- a/tests/testInteractions.c
+++ b/tests/testInteractions.c
@@ -130,13 +130,13 @@ void dump_indv_particle_fields(char *fileName, struct part *p) {
           "%8.5f "
           "%8.5f %8.5f %13e %13e %13e %13e %13e %8.5f %8.5f\n",
           p->id, p->x[0], p->x[1], p->x[2], p->v[0], p->v[1], p->v[2], p->h,
-          hydro_get_density(p),
+          hydro_get_comoving_density(p),
 #if defined(MINIMAL_SPH) || defined(SHADOWFAX_SPH)
           0.f,
 #else
           p->density.div_v,
 #endif
-          hydro_get_entropy(p), hydro_get_internal_energy(p),
+          hydro_get_comoving_entropy(p), hydro_get_comoving_internal_energy(p),
           hydro_get_pressure(p), hydro_get_soundspeed(p), p->a_hydro[0],
           p->a_hydro[1], p->a_hydro[2], p->force.h_dt,
 #if defined(GADGET2_SPH)
diff --git a/tests/testPeriodicBC.c b/tests/testPeriodicBC.c
index 53337e499673a7ac92c1e7ce3e0da189e9e76f06..1987f24132ab5a57e688c29e95289811128b2435 100644
--- a/tests/testPeriodicBC.c
+++ b/tests/testPeriodicBC.c
@@ -236,7 +236,7 @@ void dump_particle_fields(char *fileName, struct cell *main_cell, int i, int j,
             main_cell->parts[pid].x[1], main_cell->parts[pid].x[2],
             main_cell->parts[pid].v[0], main_cell->parts[pid].v[1],
             main_cell->parts[pid].v[2],
-            hydro_get_density(&main_cell->parts[pid]),
+            hydro_get_comoving_density(&main_cell->parts[pid]),
 #if defined(GIZMO_SPH) || defined(SHADOWFAX_SPH)
             0.f,
 #else
diff --git a/tests/testTimeIntegration.c b/tests/testTimeIntegration.c
index 42a3d224f43d580e512119edc55051bd22719a3b..972e6f2323c0401c70de2990bcb088f95b3dfd83 100644
--- a/tests/testTimeIntegration.c
+++ b/tests/testTimeIntegration.c
@@ -95,8 +95,8 @@ int main() {
   run.e = ŋ
 
   eng.time = 0.;
-  eng.timeBegin = 0.;
-  eng.timeEnd = N_orbits * T;
+  eng.time_begin = 0.;
+  eng.time_end = N_orbits * T;
   eng.dt_min = dt; /* This forces the time-step to be dt        */
   eng.dt_max = dt; /* irrespective of the state of the particle */
 
@@ -104,7 +104,7 @@ int main() {
   for (i = 0; i < N; i++) {
 
     /* Move forward in time */
-    eng.timeOld = eng.time;
+    eng.time_old = eng.time;
     eng.time += dt;
 
     /* Compute gravitational acceleration */