diff --git a/src/tzdb2nx/main.cpp b/src/tzdb2nx/main.cpp
index 1a92658..0b81dba 100644
--- a/src/tzdb2nx/main.cpp
+++ b/src/tzdb2nx/main.cpp
@@ -129,7 +129,7 @@ int main(int argc, char *argv[]) {
   f = STDOUT_FILENO;
   if (argc > 2) {
     filename = argv[2];
-    f = open(filename, O_WRONLY | O_CREAT | O_TRUNC);
+    f = open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0664);
 
     if (f == -1) {
       const int err = errno;