diff --git a/src/disk.rs b/src/disk.rs
index b018b5e..a039678 100644
--- a/src/disk.rs
+++ b/src/disk.rs
@@ -43,7 +43,7 @@ impl DiskController {
             .set_title(&format!("Select a file to insert"))
             .pick_file();
         match path {
-            Some(path) => Some(File::open(path).expect("failed to open disk image")),
+            Some(path) => Some(File::options().read(true).write(true).open(path).expect("failed to open disk image")),
             None => None,
         }
     }
diff --git a/src/main.rs b/src/main.rs
index e2f00e6..0946a8a 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -106,7 +106,7 @@ fn main() {
         let mut args_iter = args.iter();
         args_iter.next();
         for (i, arg) in args_iter.enumerate() {
-            bus.disk_controller.insert(File::open(&arg).expect("failed to load provided disk image"), i as u8);
+            bus.disk_controller.insert(File::options().read(true).write(true).open(&arg).expect("failed to load provided disk image"), i as u8);
         }
     }