diff --git a/oonf-olsrd2/Makefile b/oonf-olsrd2/Makefile
index 08e0901..15e5731 100644
--- a/oonf-olsrd2/Makefile
+++ b/oonf-olsrd2/Makefile
@@ -14,8 +14,8 @@ CMAKE_INSTALL:=1
 include $(INCLUDE_DIR)/package.mk
 include $(INCLUDE_DIR)/cmake.mk
 
-SPACE:=
-SPACE+=
+# ref https://stackoverflow.com/a/10571900/3990041
+SPACE:= $(subst ,, )
 CMAKE_OPTIONAL_PLUGINS:= $(subst $(SPACE),;,$(strip \
         $(if $(filter y,$(CONFIG_OONF_NHDP_AUTOLL4)),auto_ll4,) \
         $(if $(filter y,$(CONFIG_OONF_OLSRV2_LAN_IMPORT)),lan_import,) \