diff --git a/package/boost/boost.mk b/package/boost/boost.mk
index cc3ba9ee50..8159ed579f 100644
--- a/package/boost/boost.mk
+++ b/package/boost/boost.mk
@@ -102,8 +102,8 @@ endif
 BOOST_DEPENDENCIES += $(if $(BR2_ENABLE_LOCALE),,libiconv)
 endif
 
-BOOST_WITHOUT_FLAGS_COMMASEPERATED += $(subst $(space),$(comma),$(strip $(BOOST_WITHOUT_FLAGS)))
-BOOST_FLAGS += $(if $(BOOST_WITHOUT_FLAGS_COMMASEPERATED), --without-libraries=$(BOOST_WITHOUT_FLAGS_COMMASEPERATED))
+BOOST_WITHOUT_FLAGS_COMMASEPARATED += $(subst $(space),$(comma),$(strip $(BOOST_WITHOUT_FLAGS)))
+BOOST_FLAGS += $(if $(BOOST_WITHOUT_FLAGS_COMMASEPARATED), --without-libraries=$(BOOST_WITHOUT_FLAGS_COMMASEPARATED))
 BOOST_LAYOUT = $(call qstrip, $(BR2_PACKAGE_BOOST_LAYOUT))
 
 define BOOST_CONFIGURE_CMDS