diff --git a/src/main/java/com/alibaba/druid/sql/parser/Lexer.java b/src/main/java/com/alibaba/druid/sql/parser/Lexer.java
index 924dd906fd..bb3a31ed78 100644
--- a/src/main/java/com/alibaba/druid/sql/parser/Lexer.java
+++ b/src/main/java/com/alibaba/druid/sql/parser/Lexer.java
@@ -1090,7 +1090,7 @@ public class Lexer {
         
         scanChar();
         scanChar();
-        mark = pos - 1;
+        mark = pos;
         bufPos = 0;
 
         for (;;) {