diff --git a/plugins/generic/enumeration.py b/plugins/generic/enumeration.py
index f532eeadd..8e0c82e4e 100644
--- a/plugins/generic/enumeration.py
+++ b/plugins/generic/enumeration.py
@@ -1673,6 +1673,9 @@ class Enumeration:
                 stackedTest()
 
             if not kb.stackedTest and not conf.direct:
+                warnMsg  = "sql query option is only available "
+                warnMsg += "when stacked queries are supported"
+                logger.warn(warnMsg)
                 return None
             else:
                 if sqlType: