diff --git a/source/core/maptypes.h b/source/core/maptypes.h
index bb15166d0..645b80747 100644
--- a/source/core/maptypes.h
+++ b/source/core/maptypes.h
@@ -333,6 +333,7 @@ struct sectortype
 	void addceilingypan(float add) { ceilingypan_ = fmodf(ceilingypan_ + add + 512, 256); } // +512 is for handling negative offsets
 	void setceilingslope(int heinum) { ceilingheinum = heinum; if (heinum) ceilingstat |= CSTAT_SECTOR_SLOPE; else ceilingstat &= ~CSTAT_SECTOR_SLOPE; }
 	void setfloorslope(int heinum) { floorheinum = heinum; if (heinum) floorstat |= CSTAT_SECTOR_SLOPE; else floorstat &= ~CSTAT_SECTOR_SLOPE; }
+	int getfloorslope() const { return floorstat & CSTAT_SECTOR_SLOPE ? floorheinum : 0; }
 	walltype* firstWall() const;
 	walltype* lastWall() const;
 
diff --git a/source/games/duke/src/actors.cpp b/source/games/duke/src/actors.cpp
index 0fe58938b..87f55c5c4 100644
--- a/source/games/duke/src/actors.cpp
+++ b/source/games/duke/src/actors.cpp
@@ -3163,8 +3163,8 @@ void handle_se02(DDukeActor* actor)
 			}
 
 			if (abs(sc->floorheinum - actor->temp_data[5]) < 8)
-				sc->floorheinum = actor->temp_data[5];
-			else sc->floorheinum += (Sgn(actor->temp_data[5] - sc->floorheinum) << 4);
+				sc->setfloorslope(actor->temp_data[5]);
+			else sc->setfloorslope(sc->getfloorslope() + (Sgn(actor->temp_data[5] - sc->getfloorslope()) << 4));
 		}
 
 		int m = MulScale(actor->spr.xvel, bcos(actor->spr.ang), 14);
diff --git a/source/games/duke/src/spawn.cpp b/source/games/duke/src/spawn.cpp
index 2eb9aed9e..36d98c87e 100644
--- a/source/games/duke/src/spawn.cpp
+++ b/source/games/duke/src/spawn.cpp
@@ -1014,7 +1014,7 @@ void spawneffector(DDukeActor* actor, TArray<DDukeActor*>* actors)
 			}
 			else if (actor->spr.lotag == SE_2_EARTHQUAKE)
 			{
-				actor->temp_data[5] = actor->sector()->floorheinum;
+				actor->temp_data[5] = actor->sector()->getfloorslope();
 				actor->sector()->setfloorslope(0);
 			}
 	}