diff --git a/fe/fe-core/src/main/java/com/starrocks/qe/SessionVariable.java b/fe/fe-core/src/main/java/com/starrocks/qe/SessionVariable.java
index c6402288f7be1..ff41949d86beb 100644
--- a/fe/fe-core/src/main/java/com/starrocks/qe/SessionVariable.java
+++ b/fe/fe-core/src/main/java/com/starrocks/qe/SessionVariable.java
@@ -964,7 +964,7 @@ public static MaterializedViewRewriteMode parse(String str) {
     @VariableMgr.VarAttr(name = TRANSACTION_ISOLATION)
     private String transactionIsolation = "REPEATABLE-READ";
     @VariableMgr.VarAttr(name = TRANSACTION_READ_ONLY, alias = TX_READ_ONLY)
-    private String transactionReadOnly = "OFF";
+    private boolean transactionReadOnly = false;
     // this is used to make c3p0 library happy
     @VariableMgr.VarAttr(name = CHARACTER_SET_CLIENT)
     private String charsetClient = "utf8";