diff --git a/settings.py b/settings.py
index d969985..8deaf8f 100644
--- a/settings.py
+++ b/settings.py
@@ -206,7 +206,7 @@ class Settings:
 		if self.NumChal.lower() == 'random':
 			self.NumChal = "random"
 
-		if len(self.NumChal) is not 16 and not "random":
+		if len(self.NumChal) != 16 and not "random":
 			print(utils.color("[!] The challenge must be exactly 16 chars long.\nExample: 1122334455667788", 1))
 			sys.exit(-1)