diff --git a/extras/conf/SRB2-22.cfg b/extras/conf/SRB2-22.cfg
index 969f645f3..a2f56880b 100644
--- a/extras/conf/SRB2-22.cfg
+++ b/extras/conf/SRB2-22.cfg
@@ -2481,6 +2481,7 @@ linedeftypes
 			prefix = "(439)";
 			flags8text = "[3] Set delay by backside sector";
 			flags64text = "[6] Only existing";
+			flags8192text = "[13] Use backside textures";
 		}
 
 		440
@@ -6949,7 +6950,7 @@ thingtypes
 	{
 		color = 10; // Green
 		title = "Tutorial";
-		
+
 		799
 		{
 			title = "Tutorial Plant";
diff --git a/extras/conf/udb/Includes/SRB222_linedefs.cfg b/extras/conf/udb/Includes/SRB222_linedefs.cfg
index fff9edf10..1dec9ab88 100644
--- a/extras/conf/udb/Includes/SRB222_linedefs.cfg
+++ b/extras/conf/udb/Includes/SRB222_linedefs.cfg
@@ -2593,7 +2593,7 @@ udmf
 				}
 			}
 		}
-		
+
 		190
 		{
 			title = "Rising";
@@ -4588,6 +4588,12 @@ udmf
 				type = 11;
 				enum = "yesno";
 			}
+			arg3
+			{
+				title = "Use backside textures?";
+				type = 11;
+				enum = "noyes";
+			}
 		}
 
 		440
diff --git a/src/p_setup.c b/src/p_setup.c
index 146d5d302..a3fad52af 100644
--- a/src/p_setup.c
+++ b/src/p_setup.c
@@ -5198,6 +5198,7 @@ static void P_ConvertBinaryLinedefTypes(void)
 			lines[i].args[0] = tag;
 			lines[i].args[1] = TMSD_FRONTBACK;
 			lines[i].args[2] = !!(lines[i].flags & ML_NOCLIMB);
+			lines[i].args[3] = !!(lines[i].flags & ML_EFFECT6);
 			break;
 		case 441: //Condition set trigger
 			lines[i].args[0] = sides[lines[i].sidenum[0]].textureoffset >> FRACBITS;
diff --git a/src/p_spec.c b/src/p_spec.c
index 78878de1d..e8b0bcc87 100644
--- a/src/p_spec.c
+++ b/src/p_spec.c
@@ -2906,6 +2906,9 @@ static void P_ProcessLineSpecial(line_t *line, mobj_t *mo, sector_t *callsec)
 						if (always || this->bottomtexture) this->bottomtexture = set->bottomtexture;
 					}
 
+					if (line->args[3] && lines[linenum].sidenum[1] != 0xffff)
+						set = &sides[line->sidenum[1]]; // Use back side textures
+
 					// Back side
 					if (line->args[1] != TMSD_FRONT && lines[linenum].sidenum[1] != 0xffff)
 					{