diff --git a/drivers/input/mouse/trackpoint.h b/drivers/input/mouse/trackpoint.h
index 050298b..c10a6e7 100644
--- a/drivers/input/mouse/trackpoint.h
+++ b/drivers/input/mouse/trackpoint.h
@@ -142,6 +142,13 @@
 	unsigned char ext_dev;
 };
 
-extern int trackpoint_detect(struct psmouse *psmouse, int set_properties);
+#ifdef CONFIG_MOUSE_PS2_TRACKPOINT
+int trackpoint_detect(struct psmouse *psmouse, int set_properties);
+#else
+inline int trackpoint_detect(struct psmouse *psmouse, int set_properties)
+{
+	return -ENOSYS;
+}
+#endif /* CONFIG_MOUSE_PS2_TRACKPOINT */
 
 #endif /* _TRACKPOINT_H */