diff --git a/radio.c b/radio.c
index e5c0ba0..ad66c03 100644
--- a/radio.c
+++ b/radio.c
@@ -61,7 +61,15 @@ radio_tab_t* get_radio_tab() {
   return radio_tab;
 }
 
-static radio_device_t *device;          // Device-dependent interface
+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;
+}
 
 unsigned char radio_mem [1024*1024*2];  // Radio memory contents, up to 2 Mbytes
 int radio_progress;                     // Read/write progress counter
@@ -113,7 +121,7 @@ radio_device_t* radio_connect()
     }
     fprintf(stderr, "Connect to %s.\n", dev->name);
 
-    device = dev;
+    set_active_device(dev);
     return dev;
 }
 
@@ -235,7 +243,7 @@ radio_device_t* radio_read_image(const char *filename)
     dev->read_image(dev, img);
     fclose(img);
 
-    device = dev;
+    set_active_device(dev);
     return dev;
 }
 
@@ -400,11 +408,12 @@ void radio_write_csv(radio_device_t* device, const char *filename)
 //
 int radio_is_compatible(const char *name)
 {
+    radio_device_t* dev = get_active_device();
     int i;
 
     for (i=0; radio_tab[i].ident; i++) {
         // Radio is compatible when it has the same parse routine.
-        if (device->parse_parameter == radio_tab[i].device->parse_parameter &&
+        if (dev->parse_parameter == radio_tab[i].device->parse_parameter &&
             strcasecmp(name, radio_tab[i].device->name) == 0) {
             return 1;
         }