diff --git a/subprojects/blob-object-elf/src/main.c b/subprojects/blob-object-elf/src/main.c
index 9f65226..17eb0fc 100644
--- a/subprojects/blob-object-elf/src/main.c
+++ b/subprojects/blob-object-elf/src/main.c
@@ -7,6 +7,7 @@
 #include <stdio.h>
 #include <string.h>
 #include <sys/mman.h>
+#include <sys/stat.h>
 #include <unistd.h>
 
 #ifndef align_up
@@ -64,8 +65,13 @@ int main(int argc, char** argv) {
 
     close(blob_fd);
 
-    // only write is needed, but mmap requires O_RDWR
-    int output_fd = open(output_file_name, O_RDWR | O_CREAT | O_TRUNC);
+    int output_fd =
+      open(
+        output_file_name,
+        // only write is needed, but mmap requires O_RDWR
+        O_RDWR | O_CREAT | O_TRUNC,
+        S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH
+      );
     if (output_fd < 0) {
         fprintf(
             stderr,