diff --git a/src/config.h.in b/src/config.h.in
index da241d5..4c2509e 100644
--- a/src/config.h.in
+++ b/src/config.h.in
@@ -6,3 +6,5 @@
 @DFU_DEFINE@
 @PINPAD_DEFINE@
 @PINPAD_MORE_DEFINE@
+
+extern const unsigned char *unique_device_id (void);
diff --git a/src/gnuk.h b/src/gnuk.h
index 8956657..19e2c1f 100644
--- a/src/gnuk.h
+++ b/src/gnuk.h
@@ -322,5 +322,3 @@ extern uint8_t pin_input_len;
 
 extern msg_t pin_main (void *arg);
 #endif
-
-extern const uint8_t *unique_device_id (void);