diff --git a/doomsday/plugins/jdoom/defs/doom1/materials.ded b/doomsday/plugins/jdoom/defs/doom1/materials.ded
index 6e83846bff..155560f4dc 100644
--- a/doomsday/plugins/jdoom/defs/doom1/materials.ded
+++ b/doomsday/plugins/jdoom/defs/doom1/materials.ded
@@ -15,52 +15,55 @@ SkipIf -nodefaultfx;
 # Glowing flats:
 #
 
-Material Mods "flats:LAVA1" {
+Material Mods "flats:NUKAGE1" {
   Layer {
-      Stage { Glow = .9; Tics = 35; Rnd = .8; }
-      Stage { Glow = .8; Tics = 35; Rnd = .8; }
+      Stage { Glow = .75; Tics = 24; Rnd = .5; }
+      Stage { Glow = .65; Tics = 24; Rnd = .5; }
   }
 }
 
-Material Mods "flats:LAVA2" {
+Material Mods "flats:NUKAGE2" {
   Layer {
-      Stage { Glow = .9; Tics = 35; Rnd = .8; }
-      Stage { Glow = .8; Tics = 35; Rnd = .8; }
+      Stage { Glow = .75; Tics = 24; Rnd = .5; }
+      Stage { Glow = .65; Tics = 24; Rnd = .5; }
   }
 }
 
-Material Mods "flats:LAVA3" {
+Material Mods "flats:NUKAGE3" {
   Layer {
-      Stage { Glow = .9; Tics = 35; Rnd = .8; }
-      Stage { Glow = .8; Tics = 35; Rnd = .8; }
+      Stage { Glow = .75; Tics = 24; Rnd = .5; }
+      Stage { Glow = .65; Tics = 24; Rnd = .5; }
   }
 }
 
-Material Mods "flats:LAVA4" {
+# The rest of this file is skipped if DOOM - shareware.
+SkipIf doom1-share;
+
+Material Mods "flats:LAVA1" {
   Layer {
       Stage { Glow = .9; Tics = 35; Rnd = .8; }
       Stage { Glow = .8; Tics = 35; Rnd = .8; }
   }
 }
 
-Material Mods "flats:NUKAGE1" {
+Material Mods "flats:LAVA2" {
   Layer {
-      Stage { Glow = .75; Tics = 24; Rnd = .5; }
-      Stage { Glow = .65; Tics = 24; Rnd = .5; }
+      Stage { Glow = .9; Tics = 35; Rnd = .8; }
+      Stage { Glow = .8; Tics = 35; Rnd = .8; }
   }
 }
 
-Material Mods "flats:NUKAGE2" {
+Material Mods "flats:LAVA3" {
   Layer {
-      Stage { Glow = .75; Tics = 24; Rnd = .5; }
-      Stage { Glow = .65; Tics = 24; Rnd = .5; }
+      Stage { Glow = .9; Tics = 35; Rnd = .8; }
+      Stage { Glow = .8; Tics = 35; Rnd = .8; }
   }
 }
 
-Material Mods "flats:NUKAGE3" {
+Material Mods "flats:LAVA4" {
   Layer {
-      Stage { Glow = .75; Tics = 24; Rnd = .5; }
-      Stage { Glow = .65; Tics = 24; Rnd = .5; }
+      Stage { Glow = .9; Tics = 35; Rnd = .8; }
+      Stage { Glow = .8; Tics = 35; Rnd = .8; }
   }
 }