diff --git a/modules/csvparser/filterx-func-format-csv.c b/modules/csvparser/filterx-func-format-csv.c
index 5bb496a531..6af0abb3a2 100644
--- a/modules/csvparser/filterx-func-format-csv.c
+++ b/modules/csvparser/filterx-func-format-csv.c
@@ -235,7 +235,7 @@ filterx_function_format_csv_new(const gchar *function_name, FilterXFunctionArgs
 
   self->super.super.eval = _eval;
   self->super.super.free_fn = _free;
-  self->delimiter = ' ';
+  self->delimiter = ',';
 
   if (!_extract_arguments(self, args, error))
     goto error;
diff --git a/modules/csvparser/filterx-func-parse-csv.c b/modules/csvparser/filterx-func-parse-csv.c
index e329760efb..d1593026f7 100644
--- a/modules/csvparser/filterx-func-parse-csv.c
+++ b/modules/csvparser/filterx-func-parse-csv.c
@@ -326,7 +326,7 @@ filterx_function_parse_csv_new(const gchar *function_name, FilterXFunctionArgs *
   filterx_function_init_instance(&self->super, function_name);
   self->super.super.eval = _eval;
   self->super.super.free_fn = _free;
-  csv_scanner_options_set_delimiters(&self->options, " ");
+  csv_scanner_options_set_delimiters(&self->options, ",");
   csv_scanner_options_set_quote_pairs(&self->options, "\"\"''");
   csv_scanner_options_set_flags(&self->options, CSV_SCANNER_STRIP_WHITESPACE);
   csv_scanner_options_set_dialect(&self->options, CSV_SCANNER_ESCAPE_NONE);
diff --git a/modules/csvparser/tests/test_filterx_func_format_csv.c b/modules/csvparser/tests/test_filterx_func_format_csv.c
index e7490a19c9..1a25b0d6b4 100644
--- a/modules/csvparser/tests/test_filterx_func_format_csv.c
+++ b/modules/csvparser/tests/test_filterx_func_format_csv.c
@@ -102,7 +102,7 @@ Test(filterx_func_format_csv, test_array_mode_with_default_delimiter)
   GList *args = NULL;
   args = g_list_append(args, filterx_function_arg_new(NULL, csv_data));
 
-  _assert_format_csv(args, "foo bar baz");
+  _assert_format_csv(args, "foo,bar,baz");
 }
 
 Test(filterx_func_format_csv, test_array_mode_with_custom_delimiter)
@@ -124,7 +124,7 @@ Test(filterx_func_format_csv, test_array_mode_skip_column_names)
   args = g_list_append(args, filterx_function_arg_new(FILTERX_FUNC_FORMAT_CSV_ARG_NAME_COLUMNS,
                                                       filterx_non_literal_new(filterx_json_array_new_from_repr("[\"col1\",\"col2\"]", -1))));
 
-  _assert_format_csv(args, "foo bar baz");
+  _assert_format_csv(args, "foo,bar,baz");
 }
 
 Test(filterx_func_format_csv, test_dict_mode_without_column_names_with_default_delimiter)
@@ -134,7 +134,7 @@ Test(filterx_func_format_csv, test_dict_mode_without_column_names_with_default_d
   GList *args = NULL;
   args = g_list_append(args, filterx_function_arg_new(NULL, csv_data));
 
-  _assert_format_csv(args, "foo bar baz");
+  _assert_format_csv(args, "foo,bar,baz");
 }
 
 Test(filterx_func_format_csv, test_dict_mode_without_column_names_with_custom_delimiter)
@@ -158,7 +158,7 @@ Test(filterx_func_format_csv, test_dict_mode_with_column_names_with_default_deli
   args = g_list_append(args, filterx_function_arg_new(FILTERX_FUNC_FORMAT_CSV_ARG_NAME_COLUMNS,
                                                       filterx_non_literal_new(filterx_json_array_new_from_repr("[\"col2\",\"col1\"]", -1))));
 
-  _assert_format_csv(args, "bar foo");
+  _assert_format_csv(args, "bar,foo");
 }
 
 Test(filterx_func_format_csv, test_dict_mode_with_column_names_with_custom_delimiter)
diff --git a/modules/csvparser/tests/test_filterx_func_parse_csv.c b/modules/csvparser/tests/test_filterx_func_parse_csv.c
index 6f11245b4d..a54e9d46c9 100644
--- a/modules/csvparser/tests/test_filterx_func_parse_csv.c
+++ b/modules/csvparser/tests/test_filterx_func_parse_csv.c
@@ -113,7 +113,7 @@ Test(filterx_func_parse_csv, test_skipped_opts_causes_default_behaviour)
 {
   GList *args = NULL;
   args = g_list_append(args, filterx_function_arg_new(NULL,
-                                                      filterx_literal_new(filterx_string_new("foo bar baz tik tak toe", -1))));
+                                                      filterx_literal_new(filterx_string_new("foo,bar,baz,tik,tak,toe", -1))));
 
   GError *err = NULL;
   GError *args_err = NULL;
@@ -140,7 +140,7 @@ Test(filterx_func_parse_csv, test_skipped_opts_causes_default_behaviour)
 Test(filterx_func_parse_csv, test_set_optional_first_argument_column_names)
 {
   GList *args = NULL;
-  args = g_list_append(args, filterx_function_arg_new(NULL, filterx_literal_new(filterx_string_new("foo bar baz", -1))));
+  args = g_list_append(args, filterx_function_arg_new(NULL, filterx_literal_new(filterx_string_new("foo,bar,baz", -1))));
   FilterXObject *col_names = _generate_column_list("1st", "2nd", "3rd", NULL);
   args = g_list_append(args, filterx_function_arg_new(FILTERX_FUNC_PARSE_CSV_ARG_NAME_COLUMNS,
                                                       filterx_literal_new(col_names)));
@@ -171,7 +171,7 @@ Test(filterx_func_parse_csv, test_column_names_sets_expected_column_size_additio
 {
   GList *args = NULL;
   args = g_list_append(args, filterx_function_arg_new(NULL,
-                                                      filterx_literal_new(filterx_string_new("foo bar baz more columns we did not expect", -1))));
+                                                      filterx_literal_new(filterx_string_new("foo,bar,baz,more,columns,we,did,not,expect", -1))));
   FilterXObject *col_names = _generate_column_list("1st", "2nd", "3rd", NULL); // sets expected column size 3
   args = g_list_append(args, filterx_function_arg_new(FILTERX_FUNC_PARSE_CSV_ARG_NAME_COLUMNS,
                                                       filterx_literal_new(col_names)));
@@ -262,7 +262,7 @@ Test(filterx_func_parse_csv, test_optional_argument_flag_greedy)
 {
   GList *args = NULL;
   args = g_list_append(args, filterx_function_arg_new(NULL,
-                                                      filterx_literal_new(filterx_string_new("foo bar baz tik tak toe", -1))));
+                                                      filterx_literal_new(filterx_string_new("foo,bar,baz,tik,tak,toe", -1))));
   args = g_list_append(args, filterx_function_arg_new(FILTERX_FUNC_PARSE_CSV_ARG_NAME_COLUMNS,
                                                       filterx_literal_new(_generate_column_list("1st", "2nd",
                                                           "3rd", "rest", NULL)))); // columns
@@ -285,7 +285,7 @@ Test(filterx_func_parse_csv, test_optional_argument_flag_greedy)
   LogMessageValueType lmvt;
   cr_assert(filterx_object_marshal(obj, repr, &lmvt));
 
-  cr_assert_str_eq(repr->str, "{\"1st\":\"foo\",\"2nd\":\"bar\",\"3rd\":\"baz\",\"rest\":\"tik tak toe\"}");
+  cr_assert_str_eq(repr->str, "{\"1st\":\"foo\",\"2nd\":\"bar\",\"3rd\":\"baz\",\"rest\":\"tik,tak,toe\"}");
   filterx_expr_unref(func);
   filterx_object_unref(obj);
   g_error_free(err);
@@ -295,7 +295,7 @@ Test(filterx_func_parse_csv, test_optional_argument_flag_non_greedy)
 {
   GList *args = NULL;
   args = g_list_append(args, filterx_function_arg_new(NULL,
-                                                      filterx_literal_new(filterx_string_new("foo bar baz tik tak toe", -1))));
+                                                      filterx_literal_new(filterx_string_new("foo,bar,baz,tik,tak,toe", -1))));
   args = g_list_append(args, filterx_function_arg_new(FILTERX_FUNC_PARSE_CSV_ARG_NAME_COLUMNS,
                                                       filterx_literal_new(_generate_column_list("1st", "2nd",
                                                           "3rd", "rest", NULL)))); // columns