diff --git a/tools/tools/pirtool/Makefile b/tools/tools/pirtool/Makefile
index 18e6bb84ef4..a7999529c60 100644
--- a/tools/tools/pirtool/Makefile
+++ b/tools/tools/pirtool/Makefile
@@ -2,6 +2,6 @@
 
 PROG=   pirtool
 SRCS=   pirtool.c
-NO_MAN=
+NOMAN=
 
 .include <bsd.prog.mk>