diff --git a/src/compatibility.cpp b/src/compatibility.cpp
index 04b3f2ce3e..65afc72ff6 100644
--- a/src/compatibility.cpp
+++ b/src/compatibility.cpp
@@ -80,7 +80,7 @@ enum
 	CP_SETSPECIAL,
 	CP_CLEARSPECIAL,
 	CP_SETACTIVATION,
-	CP_SECTORFLOOROFFSET,
+	CP_SETSECTOROFFSET,
 	CP_SETSECTORSPECIAL,
 	CP_SETWALLYSCALE,
 	CP_SETWALLTEXTURE,
@@ -168,6 +168,11 @@ static const char *const WallTiers[] =
 	"Top", "Mid", "Bot", NULL
 };
 
+static const char *const SectorPlanes[] =
+{
+	"floor", "ceil", NULL
+};
+
 static TArray<int> CompatParams;
 static int ii_compatparams;
 static TArray<FString> TexNames;
@@ -291,12 +296,14 @@ void ParseCompatibility()
 				sc.MustGetNumber();
 				CompatParams.Push(sc.Number);
 			}
-			else if (sc.Compare("sectorflooroffset"))
+			else if (sc.Compare("setsectoroffset"))
 			{
 				if (flags.ExtCommandIndex == ~0u) flags.ExtCommandIndex = CompatParams.Size();
-				CompatParams.Push(CP_SECTORFLOOROFFSET);
+				CompatParams.Push(CP_SETSECTOROFFSET);
 				sc.MustGetNumber();
 				CompatParams.Push(sc.Number);
+				sc.MustGetString();
+				CompatParams.Push(sc.MustMatchString(SectorPlanes));
 				sc.MustGetFloat();
 				CompatParams.Push(int(sc.Float*65536.));
 			}
@@ -574,16 +581,19 @@ void SetCompatibilityParams()
 					i += 3;
 					break;
 				}
-				case CP_SECTORFLOOROFFSET:
+				case CP_SETSECTOROFFSET:
 				{
 					if ((unsigned)CompatParams[i+1] < level.sectors.Size())
 					{
 						sector_t *sec = &level.sectors[CompatParams[i+1]];
-						const double delta = CompatParams[i + 2] / 65536.0;
-						sec->floorplane.ChangeHeight(delta);
-						sec->ChangePlaneTexZ(sector_t::floor, delta);
+						const double delta = CompatParams[i + 3] / 65536.0;
+						secplane_t& plane = sector_t::floor == CompatParams[i + 2] 
+							? sec->floorplane 
+							: sec->ceilingplane;
+						plane.ChangeHeight(delta);
+						sec->ChangePlaneTexZ(CompatParams[i + 2], delta);
 					}
-					i += 3;
+					i += 4;
 					break;
 				}
 				case CP_SETSECTORSPECIAL:
diff --git a/wadsrc/static/compatibility.txt b/wadsrc/static/compatibility.txt
index 93807661eb..c48fa27ebe 100644
--- a/wadsrc/static/compatibility.txt
+++ b/wadsrc/static/compatibility.txt
@@ -2,25 +2,25 @@
 {
 	// Slightly squash the pillars in the starting room with "stimpacks"
 	// floating on them so that they can be obtained.
-	sectorflooroffset 62 -8
+	setsectoroffset 62 floor -8
 	setwallyscale 286 front bot 1.090909
 	setwallyscale 287 front bot 1.090909
 	setwallyscale 288 front bot 1.090909
 	setwallyscale 289 front bot 1.090909
 	
-	sectorflooroffset 63 -8
+	setsectoroffset 63 floor -8
 	setwallyscale 290 front bot 1.090909
 	setwallyscale 291 front bot 1.090909
 	setwallyscale 292 front bot 1.090909
 	setwallyscale 293 front bot 1.090909
 	
-	sectorflooroffset 118 -8
+	setsectoroffset 118 floor -8
 	setwallyscale 710 front bot 1.090909
 	setwallyscale 711 front bot 1.090909
 	setwallyscale 712 front bot 1.090909
 	setwallyscale 713 front bot 1.090909
 	
-	sectorflooroffset 119 -8
+	setsectoroffset 119 floor -8
 	setwallyscale 714 front bot 1.090909
 	setwallyscale 715 front bot 1.090909
 	setwallyscale 716 front bot 1.090909