diff --git a/misp_modules/modules/expansion/otx.py b/misp_modules/modules/expansion/otx.py
index 7630ff28..5a04d3a4 100755
--- a/misp_modules/modules/expansion/otx.py
+++ b/misp_modules/modules/expansion/otx.py
@@ -68,9 +68,9 @@ def isBlacklisted(value):
 
     for b in blacklist:
         if value in b:
-            return False
+            return True
 
-    return True
+    return False
 
 
 def valid_ip(ip):