diff --git a/core/display.h b/core/display.h
index a8ceb1484..e2741493f 100644
--- a/core/display.h
+++ b/core/display.h
@@ -28,8 +28,6 @@ struct plot_info {
 
 extern struct divecomputer *select_dc(struct dive *);
 
-extern unsigned int dc_number;
-
 extern int is_default_dive_computer_device(const char *);
 
 typedef void (*device_callback_t)(const char *name, void *userdata);