diff --git a/src/p_lnspec.cpp b/src/p_lnspec.cpp
index a7f799c8b..ac7520170 100644
--- a/src/p_lnspec.cpp
+++ b/src/p_lnspec.cpp
@@ -1683,10 +1683,18 @@ FUNC(LS_FloorAndCeiling_RaiseByValue)
 }
 
 FUNC(LS_FloorAndCeiling_LowerRaise)
-// FloorAndCeiling_LowerRaise (tag, fspeed, cspeed)
+// FloorAndCeiling_LowerRaise (tag, fspeed, cspeed, boomemu)
 {
-	return EV_DoCeiling (DCeiling::ceilRaiseToHighest, ln, arg0, SPEED(arg2), 0, 0, 0, 0, 0, false) |
-		   EV_DoFloor     (DFloor::floorLowerToLowest, ln, arg0, SPEED(arg1), 0, 0, 0, false);
+	bool res = EV_DoCeiling (DCeiling::ceilRaiseToHighest, ln, arg0, SPEED(arg2), 0, 0, 0, 0, 0, false);
+	// The switch based Boom equivalents of FloorandCeiling_LowerRaise do incorrect checks
+	// which cause the floor only to move when the ceiling fails to do so.
+	// To avoid problems with maps that have incorrect args this only uses a 
+	// more or less unintuitive value for the fourth arg to trigger Boom's broken behavior
+	if (arg3 != 1998 || !res)	// (1998 for the year in which Boom was released... :P)
+	{
+		res |= EV_DoFloor (DFloor::floorLowerToLowest, ln, arg0, SPEED(arg1), 0, 0, 0, false);
+	}
+	return res;
 }
 
 FUNC(LS_Elevator_MoveToFloor)
diff --git a/wadsrc/static/xlat/base.txt b/wadsrc/static/xlat/base.txt
index 45b23e52f..c4e0cc083 100644
--- a/wadsrc/static/xlat/base.txt
+++ b/wadsrc/static/xlat/base.txt
@@ -168,7 +168,7 @@ include "xlat/defines.i"
 163 = USE,		Plat_Stop (tag)
 164 = USE,		Ceiling_CrushAndRaiseA (tag, C_NORMAL, C_NORMAL, 10)
 165 = USE,		Ceiling_CrushAndRaiseSilentA (tag, C_SLOW, C_SLOW, 10)
-166 = USE,		FloorAndCeiling_LowerRaise (tag, F_SLOW, C_SLOW)
+166 = USE,		FloorAndCeiling_LowerRaise (tag, F_SLOW, C_SLOW, 1998)
 167 = USE,		Ceiling_LowerAndCrush (tag, C_SLOW, 0, 2)
 168 = USE,		Ceiling_CrushStop (tag)
 169 = USE,		Light_MaxNeighbor (tag)
@@ -188,7 +188,7 @@ include "xlat/defines.i"
 183 = USE|REP,		Ceiling_CrushAndRaiseA (tag, C_NORMAL, C_NORMAL, 10)
 184 = USE|REP,		Ceiling_CrushAndRaiseA (tag, C_SLOW, C_SLOW, 10)
 185 = USE|REP,		Ceiling_CrushAndRaiseSilentA (tag, C_SLOW, C_SLOW, 10)
-186 = USE|REP,		FloorAndCeiling_LowerRaise (tag, F_SLOW, C_SLOW)
+186 = USE|REP,		FloorAndCeiling_LowerRaise (tag, F_SLOW, C_SLOW, 1998)
 187 = USE|REP,		Ceiling_LowerAndCrush (tag, C_SLOW, 0, 2)
 188 = USE|REP,		Ceiling_CrushStop (tag)
 189 = USE,		Floor_TransferTrigger (tag)