diff --git a/sharding-core/src/main/antlr4/imports/PostgreSQLDCLStatement.g4 b/sharding-core/src/main/antlr4/imports/PostgreSQLDCLStatement.g4
index 096d7593a85032f7460425f36764f76465929c7d..6d7b77e26370f82cda5284109893c3a77c8efb9e 100644
--- a/sharding-core/src/main/antlr4/imports/PostgreSQLDCLStatement.g4
+++ b/sharding-core/src/main/antlr4/imports/PostgreSQLDCLStatement.g4
@@ -81,3 +81,7 @@ alterRoleSetConfig
 alterRoleResetConfig
     : ALTER ROLE (roleSpecification | ALL) (IN DATABASE databaseName)? RESET (STRING | ALL)
     ;
+
+dropRole
+    : DROP ROLE (IF EXISTS)? roleNames
+    ;