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-rw-r--r--libguile/coop-threads.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/libguile/coop-threads.c b/libguile/coop-threads.c
index 95eac02a7..adc2b82d5 100644
--- a/libguile/coop-threads.c
+++ b/libguile/coop-threads.c
@@ -413,7 +413,7 @@ scm_make_mutex (void)
SCM
scm_lock_mutex (SCM m)
{
- SCM_ASSERT (SCM_NIMP (m) && SCM_MUTEXP (m), m, SCM_ARG1, s_lock_mutex);
+ SCM_ASSERT (SCM_MUTEXP (m), m, SCM_ARG1, s_lock_mutex);
coop_mutex_lock (SCM_MUTEX_DATA (m));
return SCM_BOOL_T;
}