diff --git a/device-helper b/device-helper
index 8d2fe3e..b0ea005 100755
--- a/device-helper
+++ b/device-helper
@@ -17,7 +17,7 @@ create_symlink()
 
 # int main()
 {
-    [ "${dev_name=${DEVPATH##*/}}" ] || exit 1
+    [ -b "/dev/${dev_name=${DEVPATH##*/}}" ] || exit 1
 
     exec > /dev/null 2>&1