diff --git a/src/p_mobj.cpp b/src/p_mobj.cpp
index 2183f8cb9c..62da260492 100644
--- a/src/p_mobj.cpp
+++ b/src/p_mobj.cpp
@@ -5063,7 +5063,11 @@ AActor *P_SpawnMapThing (FMapThing *mthing, int position)
 	if (mthing->FloatbobPhase >= 0 && mthing->FloatbobPhase < 64) mobj->FloatBobPhase = mthing->FloatbobPhase;
 	if (mthing->Gravity < 0) mobj->Gravity = -mthing->Gravity;
 	else if (mthing->Gravity > 0) mobj->Gravity *= mthing->Gravity;
-	else mobj->flags &= ~MF_NOGRAVITY;
+	else 
+	{
+		mobj->flags |= MF_NOGRAVITY;
+		mobj->Gravity = 0;
+	}
 
 	// For Hexen floatbob 'compatibility' we do not really want to alter the floorz.
 	if (mobj->specialf1 == 0 || !(mobj->flags2 & MF2_FLOATBOB) || !(ib_compatflags & BCOMPATF_FLOATBOB))