diff --git a/usr.bin/less/Makefile b/usr.bin/less/Makefile
index c55ce3581cb..27415573a8e 100644
--- a/usr.bin/less/Makefile
+++ b/usr.bin/less/Makefile
@@ -21,5 +21,3 @@ CLEANFILES= less.1
 
 .include "Makefile.common"
 .include <bsd.prog.mk>
-
-CWARNFLAGS+=	${NO_WDEPRECATED_NON_PROTOTYPE}
diff --git a/usr.bin/lessecho/Makefile b/usr.bin/lessecho/Makefile
index 0d40cc20954..af0a7c1550a 100644
--- a/usr.bin/lessecho/Makefile
+++ b/usr.bin/lessecho/Makefile
@@ -6,5 +6,3 @@ CLEANFILES= lessecho.1
 
 .include "${SRCTOP}/usr.bin/less/Makefile.common"
 .include <bsd.prog.mk>
-
-CWARNFLAGS+=	${NO_WDEPRECATED_NON_PROTOTYPE}
diff --git a/usr.bin/lesskey/Makefile b/usr.bin/lesskey/Makefile
index 6809d9dba12..4677e7c7e6c 100644
--- a/usr.bin/lesskey/Makefile
+++ b/usr.bin/lesskey/Makefile
@@ -6,5 +6,3 @@ CLEANFILES= lesskey.1
 
 .include "${SRCTOP}/usr.bin/less/Makefile.common"
 .include <bsd.prog.mk>
-
-CWARNFLAGS+=	${NO_WDEPRECATED_NON_PROTOTYPE}