diff --git a/radio.c b/radio.c
index bf0eede..68dddf1 100644
--- a/radio.c
+++ b/radio.c
@@ -59,16 +59,6 @@ static radio_tab_t radio_tab[] = {
 };
 */
 
-static radio_device_t *active_device;          // Device-dependent interface
-
-radio_device_t* get_active_device() {
-  return active_device;
-}
-
-void set_active_device(radio_device_t* d) {
-  active_device = d;
-}
-
 //
 // Read the configuration from text file, and modify the firmware.
 //
diff --git a/src/radio.rs b/src/radio.rs
index 50d59c1..6bce35c 100644
--- a/src/radio.rs
+++ b/src/radio.rs
@@ -37,9 +37,6 @@ pub static mut radio_mem: [u8; 1024*1024*2] = [0; 1024*1024*2];
 
 extern {
 
-  fn get_active_device() -> *const radio_device_t;
-  fn set_active_device(device: *const radio_device_t);
-
   fn radio_parse_config(device: *const radio_device_t, filename: *const c_char);
 
   fn dfu_init(vid: c_uint, pid: c_uint) -> *const c_char;
@@ -55,6 +52,18 @@ extern {
   fn serial_close();
 }
 
+
+static mut active_device: *const radio_device_t = std::ptr::null(); // Device-dependent interface
+
+unsafe fn get_active_device() -> *const radio_device_t {
+  return active_device;
+}
+
+unsafe fn set_active_device(d: *const radio_device_t) {
+  active_device = d;
+}
+
+
 /// Connect to the radio via the serial port.
 /// and identify the type of device.
 pub fn connect() -> Radio {