diff --git a/wpa_supplicant/config_file.c b/wpa_supplicant/config_file.c
index 9b14699ae..f1d865ccb 100644
--- a/wpa_supplicant/config_file.c
+++ b/wpa_supplicant/config_file.c
@@ -493,7 +493,7 @@ static void write_str(FILE *f, const char *field, struct wpa_ssid *ssid)
 	if (value == NULL)
 		return;
 	fprintf(f, "\t%s=%s\n", field, value);
-	os_free(value);
+	str_clear_free(value);
 }