diff --git a/pmd-plsql/etc/grammar/PldocAST.jjt b/pmd-plsql/etc/grammar/PldocAST.jjt
index 2e59c1fb0c..b945c90524 100644
--- a/pmd-plsql/etc/grammar/PldocAST.jjt
+++ b/pmd-plsql/etc/grammar/PldocAST.jjt
@@ -301,7 +301,7 @@ ASTDDLCommand DDLCommand() :
 
 ASTSqlPlusCommand SqlPlusCommand() :
 {
-  StringBuffer sb = new StringBuffer();
+  StringBuilder sb = new StringBuilder();
 }
 {
   (