diff --git a/src/cooling/EAGLE/cooling.c b/src/cooling/EAGLE/cooling.c
index 5324ae47de9568358df9dd263c5af019b0c57860..0815b6cb8205f883f1b65ce0c2a39cf9241ff444 100644
--- a/src/cooling/EAGLE/cooling.c
+++ b/src/cooling/EAGLE/cooling.c
@@ -653,7 +653,7 @@ float cooling_get_temperature(
     const struct unit_system *restrict us,
     const struct cosmology *restrict cosmo,
     const struct cooling_function_data *restrict cooling,
-    const struct part *restrict p, struct xpart *restrict xp) {
+    const struct part *restrict p, const struct xpart *restrict xp) {
 
   /* Get physical internal energy */
   const float u = hydro_get_physical_internal_energy(p, xp, cosmo);
diff --git a/src/cooling/EAGLE/cooling.h b/src/cooling/EAGLE/cooling.h
index 7485880a145054852cd176d8bb99e91aa65f3db8..733749548dd718174d175469f6a057e2fed97c38 100644
--- a/src/cooling/EAGLE/cooling.h
+++ b/src/cooling/EAGLE/cooling.h
@@ -64,7 +64,7 @@ float cooling_get_temperature(
     const struct unit_system *restrict us,
     const struct cosmology *restrict cosmo,
     const struct cooling_function_data *restrict cooling,
-    const struct part *restrict p, struct xpart *restrict xp);
+    const struct part *restrict p, const struct xpart *restrict xp);
 
 float cooling_get_radiated_energy(const struct xpart *restrict xp);