diff --git a/Build/Configurations/ZDoom_DoomHexen.cfg b/Build/Configurations/ZDoom_DoomHexen.cfg
index 57e94069..44ff0245 100644
--- a/Build/Configurations/ZDoom_DoomHexen.cfg
+++ b/Build/Configurations/ZDoom_DoomHexen.cfg
@@ -585,6 +585,33 @@ linedefactivations
 	7168 = "Projectile hits or crosses";
 }
 
+// Linedef flags UDMF translation table
+// This is needed for copy/paste and prefabs to work properly
+// When the UDMF field name is prefixed with ! it is inverted
+linedefflagstranslation
+{
+	1 = "blocking";
+	2 = "blockmonsters";
+	4 = "twosided";
+	8 = "dontpegtop";
+	16 = "dontpegbottom";
+	32 = "secret";
+	64 = "blocksound";
+	128 = "dontdraw";
+	256 = "mapped";
+	512 = "repeatspecial";
+	1024 = "playeruse";
+	2048 = "monstercross";
+	3072 = "impact";
+	4096 = "playerpush";
+	5120 = "missilecross";
+	6144 = "passuse";
+	7168 = "impact,missilecross";
+	8192 = "monsteractivate";
+	16384 = "blockplayers";
+	32768 = "blockeverything";
+}
+
 // LINEDEF TYPES
 linedeftypes
 {
diff --git a/Build/Configurations/ZDoom_HereticHexen.cfg b/Build/Configurations/ZDoom_HereticHexen.cfg
index 66061560..5fe241fa 100644
--- a/Build/Configurations/ZDoom_HereticHexen.cfg
+++ b/Build/Configurations/ZDoom_HereticHexen.cfg
@@ -604,7 +604,9 @@ linedefflagstranslation
 	4096 = "playerpush";
 	5120 = "missilecross";
 	6144 = "passuse";
+	7168 = "impact,missilecross";
 	8192 = "monsteractivate";
+	16384 = "blockplayers";
 	32768 = "blockeverything";
 }