diff --git a/mods/ctf/ctf_map/ctf_map_core/init.lua b/mods/ctf/ctf_map/ctf_map_core/init.lua
index ca88a73..df97149 100644
--- a/mods/ctf/ctf_map/ctf_map_core/init.lua
+++ b/mods/ctf/ctf_map/ctf_map_core/init.lua
@@ -10,7 +10,7 @@ end
 function ctf_map.file_exists(subdir, target)
 	local list = minetest.get_dir_list(ctf_map.mapdir .. subdir, false)
 	if type(target) == "string" then
-		return table.indexof(list, target) ~= 1
+		return table.indexof(list, target) ~= -1
 	elseif type(target) == "table" then
 		for _, filename in pairs(target) do
 			if table.indexof(list, filename) == -1 then
diff --git a/mods/ctf/ctf_map/ctf_map_core/maps_catalog.lua b/mods/ctf/ctf_map/ctf_map_core/maps_catalog.lua
index 30b07d5..11f2ea3 100644
--- a/mods/ctf/ctf_map/ctf_map_core/maps_catalog.lua
+++ b/mods/ctf/ctf_map/ctf_map_core/maps_catalog.lua
@@ -50,9 +50,9 @@ local function show_catalog(name)
 	-- Display screenshot if present, and move other elements down
 	local y = 1
 	if ctf_map.file_exists(map.dirname, "screenshot.png") then
-		-- Check for mapdir .. "/screenshot.png", but pass in the texture
-		-- name, which would've been renamed to mapdir .. ".png"
-		fs = fs .. "image[4,1.5;6.5,3.5;" .. map.dirname .. ".png" .. "]"
+		-- Check for mapdir .. "/screenshot.png", but pass in the texture name,
+		-- which would've been renamed to "<mapdir>_screenshot.png"
+		fs = fs .. "image[4,1.5;6.5,3.5;" .. map.dirname .. "_screenshot.png" .. "]"
 		y = y + 3.5
 	end
 
diff --git a/setup_maps.sh b/setup_maps.sh
index 1322c95..283f188 100755
--- a/setup_maps.sh
+++ b/setup_maps.sh
@@ -5,7 +5,7 @@ for f in *; do
 	if [ -d ${f} ]; then
 		# Screenshot
 		if [ -f ${f}/screenshot.png ]; then
-			cp ${f}/screenshot.png ../textures/${f}.png
+			cp ${f}/screenshot.png ../textures/${f}_screenshot.png
 		fi
 
 		# Skybox textures