--- src/lib/libc/sys/sigprocmask.2	2006/05/26 19:39:37	1.3
+++ src/lib/libc/sys/sigprocmask.2	2007/09/08 20:50:50	1.4
@@ -65,7 +65,7 @@ The function is specified by
 .Fa how
 using one of the following values from
 .In signal.h :
-.Bl -tag -width SIG_UNBLOCK
+.Bl -tag -width ".Dv SIG_UNBLOCK"
 .It Dv SIG_BLOCK
 The new mask is the union of the current mask and the specified
 .Fa set .