diff --git a/src/simulation/Simulation.cpp b/src/simulation/Simulation.cpp
index d64133ba4..0e04d0319 100644
--- a/src/simulation/Simulation.cpp
+++ b/src/simulation/Simulation.cpp
@@ -305,6 +305,7 @@ GameSave * Simulation::Save(int fullX, int fullY, int fullX2, int fullY2)
 			newSave->velocityX[saveBlockY][saveBlockX] = vx[saveBlockY+blockY][saveBlockX+blockX];
 			newSave->velocityY[saveBlockY][saveBlockX] = vy[saveBlockY+blockY][saveBlockX+blockX];
 			newSave->ambientHeat[saveBlockY][saveBlockX] = hv[saveBlockY+blockY][saveBlockX+blockX];
+			newSave->hasAmbientHeat = true;
 		}
 	}