diff --git a/include/linux/dmi.h b/include/linux/dmi.h
index 00fc7a9..b1251b2 100644
--- a/include/linux/dmi.h
+++ b/include/linux/dmi.h
@@ -78,6 +78,7 @@
 extern void dmi_scan_machine(void);
 extern int dmi_get_year(int field);
 extern int dmi_name_in_vendors(const char *str);
+extern int dmi_available;
 
 #else
 
@@ -87,6 +88,7 @@
 	const struct dmi_device *from) { return NULL; }
 static inline int dmi_get_year(int year) { return 0; }
 static inline int dmi_name_in_vendors(const char *s) { return 0; }
+#define dmi_available 0
 
 #endif