diff --git a/include/linux/toshiba.h b/include/linux/toshiba.h
index 6a7c4edf0e138c38bc05cddd04603ee642cb9bf7..772dedbc3a22e039328d2e148dee867b866d007b 100644
--- a/include/linux/toshiba.h
+++ b/include/linux/toshiba.h
@@ -33,6 +33,8 @@ typedef struct {
 	unsigned int edi __attribute__ ((packed));
 } SMMRegisters;
 
+#ifdef __KERNEL__
 int tosh_smm(SMMRegisters *regs);
+#endif /* __KERNEL__ */
 
 #endif