diff --git a/src/include/86box/isartc.h b/src/include/86box/isartc.h
index ef2d7a921..65309c625 100644
--- a/src/include/86box/isartc.h
+++ b/src/include/86box/isartc.h
@@ -55,6 +55,10 @@ extern int             isartc_get_from_internal_name(const char *str);
 extern const device_t *isartc_get_device(int t);
 extern int             isartc_has_config(int board);
 
+/* On-board RTC devices */
+extern const device_t vendex_xt_rtc_onboard_device;
+extern const device_t rtc58167_device;
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/src/machine/m_xt.c b/src/machine/m_xt.c
index a5dc921b2..6b5db1e37 100644
--- a/src/machine/m_xt.c
+++ b/src/machine/m_xt.c
@@ -37,6 +37,7 @@
 #include <86box/serial.h>
 #include <86box/sio.h>
 #include <86box/ibm_5161.h>
+#include <86box/isartc.h>
 #include <86box/keyboard.h>
 #include <86box/rom.h>
 #include <86box/machine.h>
@@ -45,9 +46,6 @@
 #include <86box/port_6x.h>
 #include <86box/video.h>
 
-extern const device_t vendex_xt_rtc_onboard_device;
-extern const device_t rtc58167_device;
-
 /* 8088 */
 static void
 machine_xt_common_init(const machine_t *model, int fixed_floppy)