diff --git a/src/hydro/Gadget2/hydro_io.h b/src/hydro/Gadget2/hydro_io.h
index c1c59dfa4980a2843e7e13bee4c964c9b254cae6..706fca3258a24eb646a405553249c1c6cf78a8b7 100644
--- a/src/hydro/Gadget2/hydro_io.h
+++ b/src/hydro/Gadget2/hydro_io.h
@@ -83,7 +83,7 @@ __attribute__((always_inline)) INLINE static void hydro_write_particles(
   writeArray(h_grp, fileName, xmfFile, partTypeGroupName, "SmoothingLength",
              FLOAT, N, 1, parts, N_total, mpi_rank, offset, h, us,
              UNIT_CONV_LENGTH);
-  writeArray(h_grp, fileName, xmfFile, partTypeGroupName, "InternalEnergy",
+  writeArray(h_grp, fileName, xmfFile, partTypeGroupName, "Entropy",
              FLOAT, N, 1, parts, N_total, mpi_rank, offset, entropy, us,
              UNIT_CONV_ENTROPY_PER_UNIT_MASS);
   writeArray(h_grp, fileName, xmfFile, partTypeGroupName, "ParticleIDs",