diff --git a/Makefile.inc1 b/Makefile.inc1
index 20b381ae52de..6f858b527895 100644
--- a/Makefile.inc1
+++ b/Makefile.inc1
@@ -810,7 +810,8 @@ _cleanobj_fast_depend_hack: .PHONY
 # 20180406  r332119  setlogin
 # 20180411  r332443  exect
 # 20180525  r334224  vadvise
-.for f in exect fstat fstatat fstatfs getdirentries getfsstat setlogin shmat sigreturn statfs vadvise
+# 20180604  r334626  brk sbrk
+.for f in brk exect fstat fstatat fstatfs getdirentries getfsstat sbrk setlogin shmat sigreturn statfs vadvise
 .if exists(${OBJTOP}/lib/libc/.depend.${f}.o)
 	@if egrep -qw '${f}\.[sS]' \
 	    ${OBJTOP}/lib/libc/.depend.${f}.o; then \