diff --git a/share/man/man9/mutex.9 b/share/man/man9/mutex.9
index f2371367fb2c..43dccb7015b5 100644
--- a/share/man/man9/mutex.9
+++ b/share/man/man9/mutex.9
@@ -91,7 +91,7 @@
 .Ft void
 .Fn mtx_assert "struct mtx *mutex" "int what"
 .In sys/kernel.h
-.Fn MTX_SYSINIT "name" "struct mutex *mtx" "const char *description" "int opts"
+.Fn MTX_SYSINIT "name" "struct mtx *mtx" "const char *description" "int opts"
 .Sh DESCRIPTION
 Mutexes are the most basic and primary method of thread synchronization.
 The major design considerations for mutexes are: