diff --git a/sequence_control.py b/sequence_control.py
index ab7fa6ce05b130bb6a143a3a62e26862e87dda07..de30b37298fdaf1d22a9bc814b9fefe7c6ef9e65 100755
--- a/sequence_control.py
+++ b/sequence_control.py
@@ -89,8 +89,8 @@ def get_forbidden_sequences_nbr(sequence: str) -> bool:
     """
     seq_nbr = 0
     for seq in forbidden_sequences:
-        if seq in sequence:
-            seq_nbr += 1
+        seq_nbr += sequence.count(seq)
+
     return seq_nbr