diff --git a/source/Generating/FinishGen.cpp b/source/Generating/FinishGen.cpp
index 36114fddb..84aa019af 100644
--- a/source/Generating/FinishGen.cpp
+++ b/source/Generating/FinishGen.cpp
@@ -441,6 +441,7 @@ void cFinishGenPreSimulator::CollapseSandGravel(
 						break;
 					}
 					case E_BLOCK_AIR:
+					case E_BLOCK_FIRE:
 					case E_BLOCK_WATER:
 					case E_BLOCK_STATIONARY_WATER:
 					case E_BLOCK_LAVA: