diff --git a/Makefile.inc1 b/Makefile.inc1
index d54d26b1ad7b..da6aec1e12df 100644
--- a/Makefile.inc1
+++ b/Makefile.inc1
@@ -962,6 +962,13 @@ _cleanobj_fast_depend_hack: .PHONY
 		   ${LIBCOMPAT:D${LIBCOMPAT_OBJTOP}/lib/libc/.depend.${f}.*}; \
 	fi
 .endfor
+# 20181115  r340463  bzero reimplemented as .c
+	@if [ -e "${OBJTOP}/lib/libc/.depend.bzero.o" ] && \
+	    egrep -qw 'bzero\.[sS]' ${OBJTOP}/lib/libc/.depend.bzero.o; then \
+		echo "Removing stale dependencies for bzero"; \
+		rm -f ${OBJTOP}/lib/libc/.depend.bzero.* \
+		   ${LIBCOMPAT:D${LIBCOMPAT_OBJTOP}/lib/libc/.depend.bzero.*}; \
+	fi
 # 20181009 track migration from ntp's embedded libevent to updated one
 	@if [ -e "${OBJTOP}/usr.sbin/ntp/libntpevent/.depend.bufferevent_openssl.o" ] && \
 	    egrep -q 'contrib/ntp/sntp/libevent/bufferevent_openssl.c' \