diff --git a/src/lib/flags.c b/src/lib/flags.c
index ff21ec6..04eb814 100644
--- a/src/lib/flags.c
+++ b/src/lib/flags.c
@@ -56,6 +56,8 @@ void setEncryptionSeparator(char encryptionSeparatorNew)
 
 void setKeyLength(int keyLengthNew)
 {
+    if (keyLengthNew < 1) return;
+
     keyLength = keyLengthNew;
 }