diff --git a/libguile/ChangeLog b/libguile/ChangeLog
index d79d45ba2..504f81fc8 100644
--- a/libguile/ChangeLog
+++ b/libguile/ChangeLog
@@ -1,3 +1,8 @@
+1998-10-28  Mikael Djurfeldt  <mdj@mdj.nada.kth.se>
+
+	* threads.h (scm_thread_sleep, scm_thread_usleep): Fixed
+	declarations. (Thanks to Russ McManus.)
+
 1998-10-26  Mikael Djurfeldt  <mdj@barbara.nada.kth.se>
 
 	* numbers.c (num2long): As a software archeologist, I'm proud of
diff --git a/libguile/threads.h b/libguile/threads.h
index 9a25e1735..0385add1d 100644
--- a/libguile/threads.h
+++ b/libguile/threads.h
@@ -78,8 +78,8 @@ SCM scm_spawn_thread (scm_catch_body_t body, void *body_data,
 
 /* These are versions of the ordinary sleep and usleep functions,
    that play nicely with the thread system.  */
-SCM unsigned long scm_thread_sleep (unsigned long);
-SCM unsigned long scm_thread_usleep (unsigned long);
+SCM scm_thread_sleep (unsigned long);
+SCM scm_thread_usleep (unsigned long);
 
 
 /* The C versions of the Scheme-visible thread functions.  */