1 files changed, 1 insertions, 1 deletions

diff --git a/src/tun/Makefile.am b/src/tun/Makefile.am
index ffe58136f..1b42e53ec 100644
--- a/src/tun/Makefile.am
+++ b/src/tun/Makefile.am
@@ -27,7 +27,7 @@ check_PROGRAMS = \
  test_regex
 
 if ENABLE_TEST_RUN
-TESTS_ENVIRONMENT=export GNUNET_PREFIX=@libdir@;export PATH=@prefix@/bin:$$PATH;
+AM_TESTS_ENVIRONMENT=export GNUNET_PREFIX=$${GNUNET_PREFIX:-@libdir@};export PATH=$${GNUNET_PREFIX:-@prefix@}/bin:$$PATH;
 TESTS = $(check_PROGRAMS)
 endif