diff --git a/Makefile b/Makefile
index 0167a6c..e165bea 100644
--- a/Makefile
+++ b/Makefile
@@ -1152,7 +1152,7 @@
 env: scripts_basic
 	$(Q)$(MAKE) $(build)=tools/$@
 
-tools-all: HOST_TOOLS_ALL=y
+tools-all: export HOST_TOOLS_ALL=y
 tools-all: env tools ;
 
 .PHONY : CHANGELOG