diff --git a/include/linux/isa.h b/include/linux/isa.h
index 1b85533..b0270e3 100644
--- a/include/linux/isa.h
+++ b/include/linux/isa.h
@@ -22,7 +22,18 @@
 
 #define to_isa_driver(x) container_of((x), struct isa_driver, driver)
 
+#ifdef CONFIG_ISA
 int isa_register_driver(struct isa_driver *, unsigned int);
 void isa_unregister_driver(struct isa_driver *);
+#else
+static inline int isa_register_driver(struct isa_driver *d, unsigned int i)
+{
+	return 0;
+}
+
+static inline void isa_unregister_driver(struct isa_driver *d)
+{
+}
+#endif
 
 #endif /* __LINUX_ISA_H */