diff --git a/share/man/man9/stack.9 b/share/man/man9/stack.9
index 65676417c0d5..2c2b76241c3e 100644
--- a/share/man/man9/stack.9
+++ b/share/man/man9/stack.9
@@ -34,7 +34,7 @@
 .Nm stack
 .Nd kernel thread stack tracing routines
 .Sh SYNOPSIS
-.In sys/param.h>
+.In sys/param.h
 .In sys/stack.h
 In the kernel configuration file:
 .Cd "options DDB"