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 bfbe3f1d23..f9032f994b 100644
--- a/src/main/java/com/alibaba/druid/sql/parser/Lexer.java
+++ b/src/main/java/com/alibaba/druid/sql/parser/Lexer.java
@@ -1038,7 +1038,7 @@ public class Lexer {
     }
 
     public BigDecimal decimalValue() {
-        return new BigDecimal(text.toCharArray(), mark, bufPos);
+        return new BigDecimal(subString(mark, bufPos).toCharArray());
     }
 
     public static interface CommentHandler {