Index: uspace/lib/c/generic/ps.c
===================================================================
--- uspace/lib/c/generic/ps.c	(revision 516adcede91f3e4a1e790d6a39694d4b25772eb9)
+++ uspace/lib/c/generic/ps.c	(revision faf38b24fb042fe9f1d90d5bb4cc3c9364782df0)
@@ -74,8 +74,7 @@
  *
  */
-int get_task_threads(task_id_t taskid, thread_info_t *infos, size_t size)
+int get_task_threads(thread_info_t *infos, size_t size)
 {
-	return __SYSCALL3(SYS_PS_GET_THREADS, (sysarg_t) &taskid, (sysarg_t) infos,
-			(sysarg_t) size);
+	return __SYSCALL2(SYS_PS_GET_THREADS, (sysarg_t) infos, (sysarg_t) size);
 }
 
Index: uspace/lib/c/include/ps.h
===================================================================
--- uspace/lib/c/include/ps.h	(revision 516adcede91f3e4a1e790d6a39694d4b25772eb9)
+++ uspace/lib/c/include/ps.h	(revision faf38b24fb042fe9f1d90d5bb4cc3c9364782df0)
@@ -45,5 +45,5 @@
 extern size_t get_task_ids(task_id_t *ids, size_t size);
 extern int get_task_info(task_id_t id, task_info_t *info);
-extern int get_task_threads(task_id_t taskid, thread_info_t *infos, size_t size);
+extern int get_task_threads(thread_info_t *infos, size_t size);
 
 #endif