diff --git a/src/gausskernel/runtime/vecexecutor/vectorbatch.cpp b/src/gausskernel/runtime/vecexecutor/vectorbatch.cpp
index d33b5108a..74da33fc4 100644
--- a/src/gausskernel/runtime/vecexecutor/vectorbatch.cpp
+++ b/src/gausskernel/runtime/vecexecutor/vectorbatch.cpp
@@ -982,7 +982,7 @@ Datum ScalarVector::AddCStringVar(Datum data, int aindex)
     char* src_ptr = NULL;
     int var_len;
     src_ptr = DatumGetPointer(data);
-    Size len = strlen(DatumGetPointer(data)) + 1;
+    Size len = strlen(DatumGetPointer(data));
     char* result = NULL;
 
     if ((len + VARHDRSZ_SHORT) < VARATT_SHORT_MAX) {