fix some node distribtests
diff --git a/test/distrib/node/run_distrib_test.sh b/test/distrib/node/run_distrib_test.sh
index 90637cc..ac9e7d7 100755
--- a/test/distrib/node/run_distrib_test.sh
+++ b/test/distrib/node/run_distrib_test.sh
@@ -32,7 +32,12 @@
 
 cd $(dirname $0)
 
-nvm install $1
+NODE_VERSION="$1"
+
+# make sure nvm is available
+source ~/.nvm/nvm.sh || true
+
+nvm install $NODE_VERSION
 
 npm install -g node-static