diff --git a/pkg/oonf_api/Makefile b/pkg/oonf_api/Makefile
index 42944c5642930..a2b98a2b31bf5 100644
--- a/pkg/oonf_api/Makefile
+++ b/pkg/oonf_api/Makefile
@@ -1,6 +1,6 @@
-PKG_NAME=oonf_api
-PKG_URL=git://olsr.org/oonf_api.git
-PKG_VERSION=v0.3.0
+PKG_NAME:=oonf_api
+PKG_URL:=git://olsr.org/oonf_api.git
+PKG_VERSION:=v0.3.0
 
 ifneq ($(RIOTBOARD),)
 include $(RIOTBOARD)/$(BOARD)/Makefile.include