diff --git a/scripts/kconfig/Makefile b/scripts/kconfig/Makefile
index 3091794..231b475 100644
--- a/scripts/kconfig/Makefile
+++ b/scripts/kconfig/Makefile
@@ -11,6 +11,9 @@
 Kconfig := Kconfig
 endif
 
+# We need this, in case the user has it in its environment
+unexport CONFIG_
+
 xconfig: $(obj)/qconf
 	$< $(Kconfig)