diff --git a/sessionctx/variable/sysvar.go b/sessionctx/variable/sysvar.go
index 45b21cde90b35..6a337f98a604a 100644
--- a/sessionctx/variable/sysvar.go
+++ b/sessionctx/variable/sysvar.go
@@ -771,7 +771,7 @@ var defaultSysVars = []*SysVar{
 		}
 		return normalizedValue, nil
 	}},
-	{Scope: ScopeNone, Name: Socket, Value: "/tmp/myssock"},
+	{Scope: ScopeNone, Name: Socket, Value: ""},
 	{Scope: ScopeGlobal | ScopeSession, Name: CharacterSetConnection, Value: mysql.DefaultCharset, skipInit: true, Validation: func(vars *SessionVars, normalizedValue string, originalValue string, scope ScopeFlag) (string, error) {
 		return checkCharacterSet(normalizedValue, CharacterSetConnection)
 	}, SetSession: func(s *SessionVars, val string) error {
@@ -1274,7 +1274,6 @@ var defaultSysVars = []*SysVar{
 		return nil
 	}},
 	/* The following variable is defined as session scope but is actually server scope. */
-	{Scope: ScopeGlobal | ScopeSession, Name: TiDBEnableDynamicPrivileges, Value: On, Type: TypeBool, Hidden: true},
 	{Scope: ScopeSession, Name: TiDBGeneralLog, Value: BoolToOnOff(DefTiDBGeneralLog), Type: TypeBool, skipInit: true, SetSession: func(s *SessionVars, val string) error {
 		ProcessGeneralLog.Store(TiDBOptOn(val))
 		return nil
diff --git a/sessionctx/variable/tidb_vars.go b/sessionctx/variable/tidb_vars.go
index 58ba76f850aa9..2b82fc110e7f5 100644
--- a/sessionctx/variable/tidb_vars.go
+++ b/sessionctx/variable/tidb_vars.go
@@ -543,9 +543,6 @@ const (
 	// Now we only support TiFlash.
 	TiDBAllowFallbackToTiKV = "tidb_allow_fallback_to_tikv"
 
-	// TiDBEnableDynamicPrivileges enables MySQL 8.0 compatible dynamic privileges (experimental).
-	TiDBEnableDynamicPrivileges = "tidb_enable_dynamic_privileges"
-
 	// TiDBEnableTopSQL indicates whether the top SQL is enabled.
 	TiDBEnableTopSQL = "tidb_enable_top_sql"