diff --git a/usr.sbin/tcpdump/tcpdump/Makefile b/usr.sbin/tcpdump/tcpdump/Makefile
index bf39a291c583..eef16c72f251 100644
--- a/usr.sbin/tcpdump/tcpdump/Makefile
+++ b/usr.sbin/tcpdump/tcpdump/Makefile
@@ -56,7 +56,7 @@ LDADD=	-ll -lpcap
 DPADD+= ${LIBCRYPTO}
 LDADD+= -lcrypto
 CFLAGS+= -I${DESTDIR}/usr/include/openssl
-CFLAGS+= -DHAVE_LIBCRYPTO -DHAVE_CAST_H -DHAVE_OPENSSL_EVP_H
+CFLAGS+= -DHAVE_LIBCRYPTO -DHAVE_OPENSSL_EVP_H
 .endif
 
 .if ${MK_PF} != "no"