diff --git a/radio.c b/radio.c
index b31273a..678c008 100644
--- a/radio.c
+++ b/radio.c
@@ -157,23 +157,6 @@ radio_device_t* radio_read_image(const char *filename)
     return dev;
 }
 
-//
-// Save firmware image to the binary file.
-//
-void radio_save_image(radio_device_t* device, const char *filename)
-{
-    FILE *img;
-
-    fprintf(stderr, "Write codeplug to file '%s'.\n", filename);
-    img = fopen(filename, "wb");
-    if (! img) {
-        perror(filename);
-        exit(-1);
-    }
-    device->save_image(device, img);
-    fclose(img);
-}
-
 //
 // Read the configuration from text file, and modify the firmware.
 //
diff --git a/src/radio.rs b/src/radio.rs
index 62e8826..0f5bc0f 100644
--- a/src/radio.rs
+++ b/src/radio.rs
@@ -20,10 +20,8 @@ extern {
 
   fn set_active_device(device: *const radio_device_t);
 
-  fn radio_print_version(device: *const radio_device_t, stdout: *const libc::FILE);
   fn radio_print_config(device: *const radio_device_t, file: *const libc::FILE, verbose: c_int);
   fn radio_read_image(filename: *const c_char) -> *const radio_device_t;
-  fn radio_save_image(device: *const radio_device_t, filename: *const c_char);
   fn radio_parse_config(device: *const radio_device_t, filename: *const c_char);
   fn radio_write_csv(device: *const radio_device_t, filename: *const c_char);
 
@@ -202,10 +200,19 @@ pub fn read_image(filename: &str) -> Radio {
 
 /// Save firmware image to the binary file.
 pub fn save_image(radio: &Radio, filename: &str) {
-  let device = radio.ptr;
-  let filename = CString::new(filename.to_string()).unwrap();
+
+  eprintln!("Write codeplug to file '{}'.", filename);
+
+  let device = radio.ptr as *mut radio_device_t;
+  let file = std::fs::File::create(filename).unwrap();
+  let fd = file.as_raw_fd();
+  let mode = CString::new("wb").unwrap();
+
   unsafe {
-    radio_save_image(device, filename.as_ptr())
+    let file = libc::fdopen(fd, mode.as_ptr());
+    let save_image_fn = (*device).save_image.unwrap();
+    save_image_fn(device, file);
+    libc::fclose(file);
   }
 }