Index: uspace/srv/hid/input/port/niagara.c
===================================================================
--- uspace/srv/hid/input/port/niagara.c	(revision b19e892c22afbf67aa5988554dd3f003efeadc04)
+++ uspace/srv/hid/input/port/niagara.c	(revision 81dd2edaddd4f5ceb84c52eabccc844c4c1a5661)
@@ -135,5 +135,5 @@
 	while (1) {
 		niagara_key_pressed();
-		usleep(POLL_INTERVAL);
+		thread_usleep(POLL_INTERVAL);
 	}
 }
Index: uspace/srv/hid/input/port/ski.c
===================================================================
--- uspace/srv/hid/input/port/ski.c	(revision b19e892c22afbf67aa5988554dd3f003efeadc04)
+++ uspace/srv/hid/input/port/ski.c	(revision 81dd2edaddd4f5ceb84c52eabccc844c4c1a5661)
@@ -37,5 +37,4 @@
 
 #include <stdlib.h>
-#include <unistd.h>
 #include <sys/types.h>
 #include <thread.h>
@@ -97,5 +96,5 @@
 		}
 
-		usleep(POLL_INTERVAL);
+		thread_usleep(POLL_INTERVAL);
 	}
 }