diff --git a/lib/sysfs.h b/lib/sysfs.h
index 216af73b..351524d2 100644
--- a/lib/sysfs.h
+++ b/lib/sysfs.h
@@ -34,7 +34,7 @@ extern int sensors_read_sysfs_bus(void);
 #else
 
 #define sensors_found_sysfs 0
-#define sensors_init_sysfs()
+#define sensors_init_sysfs() 0
 #define sensors_read_sysfs_chips() (-1)
 #define sensors_read_sysfs_bus() (-1)