diff --git a/src/actor.h b/src/actor.h
index 863e4fb46a..2199c205ed 100644
--- a/src/actor.h
+++ b/src/actor.h
@@ -401,6 +401,7 @@ enum ActorFlag8
 {
 	MF8_FRIGHTENING		= 0x00000001,	// for those moments when halloween just won't do
 	MF8_INSCROLLSEC		= 0x00000002,	// actor is partially inside a scrolling sector
+	MF8_BLOCKASPLAYER	= 0x00000004,	// actor is blocked by player-blocking lines even if not a player
 };
 
 // --- mobj.renderflags ---
diff --git a/src/p_map.cpp b/src/p_map.cpp
index 8a71349674..8181df71b3 100644
--- a/src/p_map.cpp
+++ b/src/p_map.cpp
@@ -930,7 +930,10 @@ bool PIT_CheckLine(FMultiBlockLinesIterator &mit, FMultiBlockLinesIterator::Chec
 	bool NotBlocked = ((tm.thing->flags3 & MF3_NOBLOCKMONST)
 		|| ((i_compatflags & COMPATF_NOBLOCKFRIENDS) && (tm.thing->flags & MF_FRIENDLY)));
 
-	if (!(Projectile) || (ld->flags & (ML_BLOCKEVERYTHING | ML_BLOCKPROJECTILE)))
+	uint32_t ProjectileBlocking = ML_BLOCKEVERYTHING | ML_BLOCKPROJECTILE;
+	if ( tm.thing->flags8 & MF8_BLOCKASPLAYER ) ProjectileBlocking |= ML_BLOCK_PLAYERS | ML_BLOCKING;
+
+	if (!(Projectile) || (ld->flags & ProjectileBlocking) )
 	{
 		if (ld->flags & ML_RAILING)
 		{
@@ -938,7 +941,7 @@ bool PIT_CheckLine(FMultiBlockLinesIterator &mit, FMultiBlockLinesIterator::Chec
 		}
 		else if ((ld->flags & (ML_BLOCKING | ML_BLOCKEVERYTHING)) || 				// explicitly blocking everything
 			(!(NotBlocked) && (ld->flags & ML_BLOCKMONSTERS)) || 				// block monsters only
-			(tm.thing->player != NULL && (ld->flags & ML_BLOCK_PLAYERS)) ||		// block players
+			(((tm.thing->player != NULL) || (tm.thing->flags8 & MF8_BLOCKASPLAYER)) && (ld->flags & ML_BLOCK_PLAYERS)) ||		// block players
 			((Projectile) && (ld->flags & ML_BLOCKPROJECTILE)) ||				// block projectiles
 			((tm.thing->flags & MF_FLOAT) && (ld->flags & ML_BLOCK_FLOATERS)))	// block floaters
 		{
@@ -3100,7 +3103,7 @@ void FSlide::SlideTraverse(const DVector2 &start, const DVector2 &end)
 		{
 			goto isblocking;
 		}
-		if (li->flags & ML_BLOCK_PLAYERS && slidemo->player != NULL)
+		if (li->flags & ML_BLOCK_PLAYERS && ((slidemo->player != NULL) || (slidemo->flags8 & MF8_BLOCKASPLAYER)))
 		{
 			goto isblocking;
 		}
diff --git a/src/po_man.cpp b/src/po_man.cpp
index 76355d4db5..ca12120de8 100644
--- a/src/po_man.cpp
+++ b/src/po_man.cpp
@@ -1157,7 +1157,7 @@ bool FPolyObj::CheckMobjBlocking (side_t *sd)
 						// [TN] Check wether this actor gets blocked by the line.
 						if (ld->backsector != NULL &&
 							!(ld->flags & (ML_BLOCKING|ML_BLOCKEVERYTHING))
-							&& !(ld->flags & ML_BLOCK_PLAYERS && mobj->player) 
+							&& !(ld->flags & ML_BLOCK_PLAYERS && (mobj->player || (mobj->flags8 & MF8_BLOCKASPLAYER))) 
 							&& !(ld->flags & ML_BLOCKMONSTERS && mobj->flags3 & MF3_ISMONSTER)
 							&& !((mobj->flags & MF_FLOAT) && (ld->flags & ML_BLOCK_FLOATERS))
 							&& (!(ld->flags & ML_3DMIDTEX) ||
diff --git a/src/scripting/thingdef_data.cpp b/src/scripting/thingdef_data.cpp
index 002c0a81a0..1416cbc7aa 100644
--- a/src/scripting/thingdef_data.cpp
+++ b/src/scripting/thingdef_data.cpp
@@ -316,6 +316,7 @@ static FFlagDef ActorFlagDefs[]=
 	DEFINE_FLAG(MF7, FORCEINFIGHTING, AActor, flags7),
 
 	DEFINE_FLAG(MF8, FRIGHTENING, AActor, flags8),
+	DEFINE_FLAG(MF8, BLOCKASPLAYER, AActor, flags8),
 
 	// Effect flags
 	DEFINE_FLAG(FX, VISIBILITYPULSE, AActor, effects),