diff --git a/ttcn3-stp-test/Makefile b/ttcn3-stp-test/Makefile
index cbcd5445..76fdbfc6 100644
--- a/ttcn3-stp-test/Makefile
+++ b/ttcn3-stp-test/Makefile
@@ -1,3 +1,4 @@
 RUN_ARGS?=--sysctl net.ipv6.conf.all.disable_ipv6=0 --rm --network sigtran --ip 172.18.2.202 -v ggsn-test-vol:/data
+OSMO_TTCN3_BRANCH="laforge/stp"
 
 include ../make/Makefile