diff --git a/lib/libc_r/man/pthread_once.3 b/lib/libc_r/man/pthread_once.3
index af203fc31a2..e77e1803737 100644
--- a/lib/libc_r/man/pthread_once.3
+++ b/lib/libc_r/man/pthread_once.3
@@ -41,7 +41,7 @@
 .Sh SYNOPSIS
 .Fd #include <pthread.h>
 .Pp
-pthread_once
+pthread_once_t
 .Fa once_control
 = PTHREAD_ONCE_INIT;
 .Ft int
diff --git a/lib/libpthread/man/pthread_once.3 b/lib/libpthread/man/pthread_once.3
index af203fc31a2..e77e1803737 100644
--- a/lib/libpthread/man/pthread_once.3
+++ b/lib/libpthread/man/pthread_once.3
@@ -41,7 +41,7 @@
 .Sh SYNOPSIS
 .Fd #include <pthread.h>
 .Pp
-pthread_once
+pthread_once_t
 .Fa once_control
 = PTHREAD_ONCE_INIT;
 .Ft int
diff --git a/share/man/man3/pthread_once.3 b/share/man/man3/pthread_once.3
index af203fc31a2..e77e1803737 100644
--- a/share/man/man3/pthread_once.3
+++ b/share/man/man3/pthread_once.3
@@ -41,7 +41,7 @@
 .Sh SYNOPSIS
 .Fd #include <pthread.h>
 .Pp
-pthread_once
+pthread_once_t
 .Fa once_control
 = PTHREAD_ONCE_INIT;
 .Ft int