diff --git a/libguile/deprecated.c b/libguile/deprecated.c
index d2e01f3b7..6da604e42 100644
--- a/libguile/deprecated.c
+++ b/libguile/deprecated.c
@@ -699,6 +699,21 @@ scm_make_mutex_with_flags (SCM flags)
   return scm_make_mutex_with_kind (kind);
 }
 
+SCM
+scm_lock_mutex_timed (SCM m, SCM timeout, SCM owner)
+{
+  scm_c_issue_deprecation_warning
+    ("'scm_lock_mutex_timed' is deprecated.  "
+     "Use 'scm_timed_lock_mutex' instead.");
+
+  if (!SCM_UNBNDP (owner) && !scm_is_false (owner))
+    scm_c_issue_deprecation_warning
+      ("The 'owner' argument to 'scm_lock_mutex_timed' is deprecated.  "
+       "Use SRFI-18 directly if you need this concept.");
+
+  return scm_timed_lock_mutex (m, timeout);
+}
+
 SCM
 scm_unlock_mutex_timed (SCM mx, SCM cond, SCM timeout)
 {
diff --git a/libguile/deprecated.h b/libguile/deprecated.h
index 5948fc512..211266f6d 100644
--- a/libguile/deprecated.h
+++ b/libguile/deprecated.h
@@ -240,6 +240,7 @@ SCM_DEPRECATED void scm_dynwind_critical_section (SCM mutex);
 
 SCM_DEPRECATED SCM scm_make_mutex_with_flags (SCM flags);
 SCM_DEPRECATED SCM scm_unlock_mutex_timed (SCM mx, SCM cond, SCM timeout);
+SCM_DEPRECATED SCM scm_lock_mutex_timed (SCM m, SCM timeout, SCM owner);
 
 
 
diff --git a/libguile/threads.c b/libguile/threads.c
index d7295bc9f..0da9de1ff 100644
--- a/libguile/threads.c
+++ b/libguile/threads.c
@@ -987,7 +987,8 @@ scm_cancel_thread (SCM thread)
   return SCM_UNSPECIFIED;
 }
 
-SCM scm_join_thread (SCM thread)
+SCM
+scm_join_thread (SCM thread)
 {
   return scm_join_thread_timed (thread, SCM_UNDEFINED, SCM_UNDEFINED);
 }
@@ -1201,20 +1202,17 @@ fat_mutex_lock (SCM mutex, scm_t_timespec *timeout, int *ret)
   return err;
 }
 
-SCM scm_lock_mutex (SCM mx)
+SCM
+scm_lock_mutex (SCM mx)
 {
-  return scm_lock_mutex_timed (mx, SCM_UNDEFINED, SCM_UNDEFINED);
+  return scm_timed_lock_mutex (mx, SCM_UNDEFINED);
 }
 
-SCM_DEFINE (scm_lock_mutex_timed, "lock-mutex", 1, 2, 0,
-	    (SCM m, SCM timeout, SCM owner),
+SCM_DEFINE (scm_timed_lock_mutex, "lock-mutex", 1, 1, 0,
+	    (SCM m, SCM timeout),
 	    "Lock mutex @var{m}. If the mutex is already locked, the calling\n"
-	    "thread blocks until the mutex becomes available. The function\n"
-	    "returns when the calling thread owns the lock on @var{m}.\n"
-	    "Locking a mutex that a thread already owns will succeed right\n"
-	    "away and will not block the thread.  That is, Guile's mutexes\n"
-	    "are @emph{recursive}.")
-#define FUNC_NAME s_scm_lock_mutex_timed
+	    "thread blocks until the mutex becomes available.")
+#define FUNC_NAME s_scm_timed_lock_mutex
 {
   SCM exception;
   int ret = 0;
@@ -1228,11 +1226,6 @@ SCM_DEFINE (scm_lock_mutex_timed, "lock-mutex", 1, 2, 0,
       waittime = &cwaittime;
     }
 
-  if (!SCM_UNBNDP (owner) && !scm_is_false (owner))
-    scm_c_issue_deprecation_warning
-      ("The 'owner' argument to lock-mutex is deprecated.  Use SRFI-18 "
-       "directly if you need this concept.");
-
   exception = fat_mutex_lock (m, waittime, &ret);
   if (!scm_is_false (exception))
     scm_ithrow (SCM_CAR (exception), scm_list_1 (SCM_CDR (exception)), 1);
@@ -1264,7 +1257,7 @@ scm_dynwind_lock_mutex (SCM mutex)
 SCM
 scm_try_mutex (SCM mutex)
 {
-  return scm_lock_mutex_timed (mutex, SCM_INUM0, SCM_UNDEFINED);
+  return scm_timed_lock_mutex (mutex, SCM_INUM0);
 }
 
 /*** Fat condition variables */
diff --git a/libguile/threads.h b/libguile/threads.h
index 1da7bbf4a..ce8148f4e 100644
--- a/libguile/threads.h
+++ b/libguile/threads.h
@@ -152,7 +152,7 @@ SCM_API SCM scm_make_mutex (void);
 SCM_API SCM scm_make_recursive_mutex (void);
 SCM_API SCM scm_make_mutex_with_kind (SCM kind);
 SCM_API SCM scm_lock_mutex (SCM m);
-SCM_API SCM scm_lock_mutex_timed (SCM m, SCM timeout, SCM owner);
+SCM_API SCM scm_timed_lock_mutex (SCM m, SCM timeout);
 SCM_API void scm_dynwind_lock_mutex (SCM mutex);
 SCM_API SCM scm_try_mutex (SCM m);
 SCM_API SCM scm_unlock_mutex (SCM m);