diff --git a/include/asm-generic/termios.h b/include/asm-generic/termios.h
index 33dca30..7d39ecc 100644
--- a/include/asm-generic/termios.h
+++ b/include/asm-generic/termios.h
@@ -61,8 +61,14 @@
 	return 0;
 }
 
+#ifndef user_termios_to_kernel_termios
 #define user_termios_to_kernel_termios(k, u) copy_from_user(k, u, sizeof(struct termios))
+#endif
+
+#ifndef kernel_termios_to_user_termios
 #define kernel_termios_to_user_termios(u, k) copy_to_user(u, k, sizeof(struct termios))
+#endif
+
 #define user_termios_to_kernel_termios_1(k, u) copy_from_user(k, u, sizeof(struct termios))
 #define kernel_termios_to_user_termios_1(u, k) copy_to_user(u, k, sizeof(struct termios))