diff --git a/src/main/java/com/alibaba/druid/wall/spi/MySqlWallVisitor.java b/src/main/java/com/alibaba/druid/wall/spi/MySqlWallVisitor.java
index 92cb6d017e..42995e4e74 100644
--- a/src/main/java/com/alibaba/druid/wall/spi/MySqlWallVisitor.java
+++ b/src/main/java/com/alibaba/druid/wall/spi/MySqlWallVisitor.java
@@ -300,6 +300,7 @@ public class MySqlWallVisitor extends MySqlASTVisitorAdapter implements WallVisi
             varName = varName.substring(2);
         }
 
+        varName = varName.toLowerCase();
         return config.getDenyVariants().contains(varName);
     }
 
@@ -515,4 +516,4 @@ public class MySqlWallVisitor extends MySqlASTVisitorAdapter implements WallVisi
     public boolean visit(SQLCreateTriggerStatement x) {
         return false;
     }
-}
+}
\ No newline at end of file