diff --git a/tools/Conversion_Table.csv b/tools/Conversion_Table.csv
index 55d18d018d..9daa11898b 100644
--- a/tools/Conversion_Table.csv
+++ b/tools/Conversion_Table.csv
@@ -898,3 +898,7 @@ Source path,Source file,Target path,Target file,xs,ys,xl,yl,xt,yt,Blacklisted?
 /assets/minecraft/textures/blocks,endframe_side.png,/mods/ITEMS/mcl_portals/textures,mcl_portals_endframe_side.png,,,,,,,
 /assets/minecraft/textures/blocks,endframe_eye.png,/mods/ITEMS/mcl_portals/textures,mcl_portals_endframe_eye.png,,,,,,,
 /assets/minecraft/textures/blocks,end_stone.png,/mods/ITEMS/mcl_portals/textures,mcl_portals_endframe_bottom.png,,,,,,,
+/assets/minecraft/textures/blocks,red_nether_brick.png,,mcl_supplemental_fence_red_nether_brick.png,,,,,,,
+/assets/minecraft/textures/blocks,red_nether_brick.png,,mcl_supplemental_fence_gate_red_nether_brick.png,,,,,,,
+/assets/minecraft/textures/blocks,nether_brick.png,,mcl_supplemental_fence_gate_nether_brick.png,,,,,,,
+/assets/minecraft/textures/blocks,stonebrick_carved.png,,mcl_supplemental_stonebrick_carved_slab.png,,,,,,,
diff --git a/tools/Texture_Converter.py b/tools/Texture_Converter.py
index 1fcf6054f1..addebf5cd1 100755
--- a/tools/Texture_Converter.py
+++ b/tools/Texture_Converter.py
@@ -160,6 +160,13 @@ def convert_textures():
 				# Skip blacklisted files
 				continue
 
+			if make_texture_pack == False and dst_dir == "":
+				# If destination dir is empty, this texture is not supposed to be used in MCL2
+				# (but maybe an external mod). It should only be used in texture packs.
+				# Otherwise, it must be ignored.
+				# Example: textures for mcl_supplemental
+				continue
+
 			src_file = base_dir + src_dir + "/" + src_filename # source file
 			src_file_exists = os.path.isfile(src_file)
 			dst_file = target_dir(dst_dir) + "/" + dst_filename # destination file