diff --git a/be/src/util/jsonb_parser.h b/be/src/util/jsonb_parser.h
index 1591fa563c788a..c90012a4fbef30 100644
--- a/be/src/util/jsonb_parser.h
+++ b/be/src/util/jsonb_parser.h
@@ -369,8 +369,8 @@ class JsonbParserT {
                 key[key_len++] = ch;
             }
         }
-
-        if (!in.good() || in.peek() != '"' || key_len == 0) {
+        // The JSON key can be an empty string.
+        if (!in.good() || in.peek() != '"') {
             if (key_len == JsonbKeyValue::sMaxKeyLen)
                 err_ = JsonbErrType::E_INVALID_KEY_LENGTH;
             else