Index: uspace/lib/c/include/device/char_dev.h
===================================================================
--- uspace/lib/c/include/device/char_dev.h	(revision ce79069b92de331e039d57e0c8a3d64e644321a5)
+++ uspace/lib/c/include/device/char_dev.h	(revision ab547063e6898afc80a98b4f9621364f7c9990d8)
@@ -36,4 +36,6 @@
 #define LIBC_DEVICE_CHAR_DEV_H_
 
+#include <async.h>
+
 typedef enum {
 	CHAR_DEV_READ = 0,
@@ -41,6 +43,6 @@
 } char_dev_method_t;
 
-ssize_t char_dev_read(int dev_phone, void *buf, size_t len);
-ssize_t char_dev_write(int dev_phone, void *buf, size_t len);
+extern ssize_t char_dev_read(async_sess_t *, void *, size_t);
+extern ssize_t char_dev_write(async_sess_t *, void *, size_t);
 
 #endif