diff --git a/platform/cooja/Makefile.cooja b/platform/cooja/Makefile.cooja
index bd5ea1b92..61c958735 100644
--- a/platform/cooja/Makefile.cooja
+++ b/platform/cooja/Makefile.cooja
@@ -88,6 +88,14 @@ ifdef WITH_UIP
   CFLAGS += -DWITH_UIP=1
 endif
 
+## Copied from Makefile.include, since Cooja overrides CFLAGS et al
+ifdef UIP_CONF_IPV6
+  CFLAGS += -DUIP_CONF_IPV6=1
+  ifneq ($(UIP_CONF_RPL),0)
+    CFLAGS += -DUIP_CONF_IPV6_RPL=1
+  endif # UIP_CONF_RPL
+endif # UIP_CONF_IPV6
+
 REDEF_PRINTF=1 # Redefine functions to enable printf()s inside Cooja
 
 ### Define custom targets