diff --git a/Makefile.inc1 b/Makefile.inc1
index a01286a448de..71006bc014da 100644
--- a/Makefile.inc1
+++ b/Makefile.inc1
@@ -623,9 +623,9 @@ _includes:
 # Special handling for SUBDIR_OVERRIDE in buildworld as they most likely need
 # headers from default SUBDIR.  Do SUBDIR_OVERRIDE includes last.
 	${_+_}cd ${.CURDIR}; ${WMAKE} SUBDIR_OVERRIDE= SHARED=symlinks \
-	    includes
+	    MK_INCLUDES=yes includes
 .if !empty(SUBDIR_OVERRIDE) && make(buildworld)
-	${_+_}cd ${.CURDIR}; ${WMAKE} SHARED=symlinks includes
+	${_+_}cd ${.CURDIR}; ${WMAKE} MK_INCLUDES=yes SHARED=symlinks includes
 .endif
 _libraries:
 	@echo