diff --git a/src/wal/inc/walInt.h b/src/wal/inc/walInt.h
index 511f8320f0427e64294021f9317774771449e821..7e731d44db8506cead8d052ae8ce2476a207c86e 100644
--- a/src/wal/inc/walInt.h
+++ b/src/wal/inc/walInt.h
@@ -32,7 +32,7 @@ extern int32_t wDebugFlag;
 #define wTrace(...) { if (wDebugFlag & DEBUG_TRACE) { taosPrintLog("WAL ", wDebugFlag, __VA_ARGS__); }}
 
 #define WAL_PREFIX     "wal"
-#define WAL_PREFIX_LEN 2
+#define WAL_PREFIX_LEN 3
 #define WAL_REFRESH_MS 1000
 #define WAL_MAX_SIZE   (1024 * 1024)
 #define WAL_SIGNATURE  ((uint32_t)(0xFAFBFDFE))