diff --git a/Makefile b/Makefile
index e788f1bef..53f8ad599 100644
--- a/Makefile
+++ b/Makefile
@@ -292,6 +292,7 @@ unexport TAR_OPTIONS
 unexport CONFIG_SITE
 unexport QMAKESPEC
 unexport TERMINFO
+unexport MACHINE
 
 GNU_HOST_NAME := $(shell support/gnuconfig/config.guess)