diff --git a/src/ngx_http_rds_csv_filter_module.c b/src/ngx_http_rds_csv_filter_module.c
index 4fd405b..5f01bf3 100644
--- a/src/ngx_http_rds_csv_filter_module.c
+++ b/src/ngx_http_rds_csv_filter_module.c
@@ -96,6 +96,15 @@ static ngx_command_t  ngx_http_rds_csv_commands[] = {
       offsetof(ngx_http_rds_csv_loc_conf_t, buf_size),
       NULL },
 
+    { ngx_string("rds_csv_quote_string"),
+      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF
+          |NGX_HTTP_LOC_CONF|NGX_HTTP_LIF_CONF
+          |NGX_CONF_FLAG,
+      ngx_conf_set_flag_slot,
+      NGX_HTTP_LOC_CONF_OFFSET,
+      offsetof(ngx_http_rds_csv_loc_conf_t, quote_string),
+      NULL },
+
       ngx_null_command
 };
 
@@ -396,6 +405,7 @@ ngx_http_rds_csv_create_loc_conf(ngx_conf_t *cf)
     conf->field_sep = NGX_CONF_UNSET_UINT;
     conf->buf_size = NGX_CONF_UNSET_SIZE;
     conf->field_name_header = NGX_CONF_UNSET;
+    conf->quote_string = NGX_CONF_UNSET;
 
     return conf;
 }
@@ -410,6 +420,8 @@ ngx_http_rds_csv_merge_loc_conf(ngx_conf_t *cf, void *parent, void *child)
     ngx_conf_merge_value(conf->enabled, prev->enabled, 0);
 
     ngx_conf_merge_value(conf->field_name_header, prev->field_name_header, 1);
+    
+    ngx_conf_merge_value(conf->quote_string, prev->quote_string, 1);
 
     ngx_conf_merge_uint_value(conf->field_sep, prev->field_sep,
                               (ngx_uint_t) ',');
diff --git a/src/ngx_http_rds_csv_filter_module.h b/src/ngx_http_rds_csv_filter_module.h
index ab43c4a..8b589be 100644
--- a/src/ngx_http_rds_csv_filter_module.h
+++ b/src/ngx_http_rds_csv_filter_module.h
@@ -33,6 +33,7 @@ typedef struct {
     size_t                           buf_size;
     ngx_flag_t                       field_name_header;
     ngx_str_t                        content_type;
+    ngx_flag_t                       quote_string;
 } ngx_http_rds_csv_loc_conf_t;
 
 
diff --git a/src/ngx_http_rds_csv_output.c b/src/ngx_http_rds_csv_output.c
index ca7609a..9c62e88 100644
--- a/src/ngx_http_rds_csv_output.c
+++ b/src/ngx_http_rds_csv_output.c
@@ -355,7 +355,11 @@ ngx_http_rds_csv_output_field(ngx_http_request_t *r,
 
         default:
             dd("string field found");
-
+            if (!conf->quote_string) {
+                dd("no need to quote string.");
+                size += len;
+                break;
+            }
             val_escape = ngx_http_rds_csv_escape_csv_str(sep, NULL, data, len,
                                                          &need_quotes);
 
@@ -410,6 +414,11 @@ ngx_http_rds_csv_output_field(ngx_http_request_t *r,
 
         default:
             /* string */
+            if (!conf->quote_string) {
+                dd("no need to quote string, just copy string buffer.");
+                last = ngx_copy(last, data, len);
+                break;
+            }
             if (need_quotes) {
                 *last++ = '"';
             }
@@ -492,7 +501,11 @@ ngx_http_rds_csv_output_more_field_data(ngx_http_request_t *r,
 
     default:
         /* string */
-
+        if (!conf->quote_string) {
+            dd("no need to quote string.");
+            size += len;
+            break;
+        }
         escape = ngx_http_rds_csv_escape_csv_str(sep, NULL, data, len,
                                                  &need_quotes);
 
@@ -530,6 +543,11 @@ ngx_http_rds_csv_output_more_field_data(ngx_http_request_t *r,
 
     default:
         /* string */
+        if (!conf->quote_string) {
+            dd("no need to quote string, just copy string buffer.");
+            last = ngx_copy(last, data, len);
+            break;
+        }
         if (escape == 0) {
             last = ngx_copy(last, data, len);