diff --git a/src/compatibility.cpp b/src/compatibility.cpp
index 0b27a1efa..37531d40f 100644
--- a/src/compatibility.cpp
+++ b/src/compatibility.cpp
@@ -86,6 +86,7 @@ enum
 	CP_SETTHINGZ,
 	CP_SETTAG,
 	CP_SETTHINGFLAGS,
+	CP_SETVERTEX,
 };
 
 // EXTERNAL FUNCTION PROTOTYPES --------------------------------------------
@@ -345,7 +346,19 @@ void ParseCompatibility()
 				sc.MustGetNumber();
 				CompatParams.Push(sc.Number);
 			}
-			else 
+			else if (sc.Compare("setvertex"))
+			{
+				if (flags.ExtCommandIndex == ~0u) flags.ExtCommandIndex = CompatParams.Size();
+				CompatParams.Push(CP_SETVERTEX);
+				sc.MustGetNumber();
+				CompatParams.Push(sc.Number);
+				sc.MustGetFloat();
+				CompatParams.Push(int(sc.Float * 256));	// do not use full fixed here so that it can eventually handle larger levels
+				sc.MustGetFloat();
+				CompatParams.Push(int(sc.Float * 256));	// do not use full fixed here so that it can eventually handle larger levels
+				flags.CompatFlags[SLOT_BCOMPAT] |= BCOMPATF_REBUILDNODES;
+			}
+			else
 			{
 				sc.UnGet();
 				break;
@@ -600,6 +613,16 @@ void SetCompatibilityParams()
 					i += 3;
 					break;
 				}
+				case CP_SETVERTEX:
+				{
+					if ((unsigned)CompatParams[i + 1] < level.vertexes.Size())
+					{
+						level.vertexes[CompatParams[i + 1]].p.X = CompatParams[i + 2] / 256.;
+						level.vertexes[CompatParams[i + 1]].p.Y = CompatParams[i + 3] / 256.;
+					}
+					i += 4;
+					break;
+				}
 			}
 		}
 	}
diff --git a/wadsrc/static/compatibility.txt b/wadsrc/static/compatibility.txt
index 020d8477d..9f7564b95 100644
--- a/wadsrc/static/compatibility.txt
+++ b/wadsrc/static/compatibility.txt
@@ -497,6 +497,12 @@ ABC4EB5A1535ECCD0061AD14F3547908 // Plutonia Experiment, map26
 	setsectorspecial 156 0
 }
 
+B68EB7CFB4CC481796E2919B9C16DFBD // Moc11.wad e1m6
+{
+	setvertex 1650 -3072 2671
+	setvertex 1642 -2944 2671
+}
+
 712BB4CFBD0753178CA0C6814BE4C288 // map12 BTSX_E1 - patch some rendering glitches that are problematic to detect
 {
 	setsectortag 545 32000