diff --git a/Makefile.inc1 b/Makefile.inc1
index c8d5f32f0cf5..f0632112797f 100644
--- a/Makefile.inc1
+++ b/Makefile.inc1
@@ -939,6 +939,15 @@ _cleanobj_fast_depend_hack: .PHONY
 		    ${LIBCOMPAT:D${LIBCOMPAT_OBJTOP}/lib/libc/.depend.${f}.*}; \
 	fi
 .endfor
+# 20181013  r339348  bcopy reimplemented as .c
+.for f in bcopy memcpy memmove
+	@if [ -e "${OBJTOP}/lib/libc/.depend.${f}.o" ] && \
+	    egrep -qw 'bcopy\.[sS]' ${OBJTOP}/lib/libc/.depend.${f}.o; then \
+		echo "Removing stale dependencies for bcopy"; \
+		rm -f ${OBJTOP}/lib/libc/.depend.${f}.* \
+		   ${LIBCOMPAT:D${LIBCOMPAT_OBJTOP}/lib/libc/.depend.${f}.*}; \
+	fi
+.endfor
 # 20181009 track migration from ntp's embedded libevent to updated one
 	@if [ -e "${OBJTOP}/usr.sbin/ntp/libntpevent/.depend.bufferevent_openssl.o" ] && \
 	    egrep -q 'contrib/ntp/sntp/libevent/bufferevent_openssl.c' \