Index: uspace/lib/drv/generic/logbuf.c
===================================================================
--- uspace/lib/drv/generic/logbuf.c	(revision cfb797479986d908acecc09ba43bc68e3051022f)
+++ uspace/lib/drv/generic/logbuf.c	(revision e61aa802b6438793f4a350ef8eec5266ca467d80)
@@ -35,4 +35,5 @@
 #include <ddf/log.h>
 #include <assert.h>
+#include <unistd.h>
 
 /** Formatting string for printing number of not-printed items. */