diff --git a/src/install.sh b/src/install.sh
index f93a6c4a2..c1ed86ace 100644
--- a/src/install.sh
+++ b/src/install.sh
@@ -200,14 +200,16 @@ abortInstall() {
 detectCustom() {
 
   local file base
+  local fname="custom.iso"
+
   CUSTOM=""
 
-  if [ -d "/custom.iso" ]; then
-    error "The file /custom.iso has an invalid path!" && return 1
+  if [ -d "/$fname" ]; then
+    error "The file /$fname has an invalid path!" && return 1
   fi
 
-  file=$(find / -maxdepth 1 -type f -iname custom.iso | head -n 1)
-  [ ! -s "$file" ] && file=$(find "$STORAGE" -maxdepth 1 -type f -iname custom.iso | head -n 1)
+  file=$(find / -maxdepth 1 -type f -iname "$fname" | head -n 1)
+  [ ! -s "$file" ] && file=$(find "$STORAGE" -maxdepth 1 -type f -iname "$fname" | head -n 1)
 
   if [ ! -s "$file" ] && [[ "${VERSION,,}" != "http"* ]]; then
     base=$(basename "$VERSION")