diff --git a/tests/b_tests.sh b/tests/b_tests.sh
index f4e043c..45cb4f7 100755
--- a/tests/b_tests.sh
+++ b/tests/b_tests.sh
@@ -18,6 +18,9 @@
 
 source $(dirname $0)/../envsetup.sh
 
+# lunch required to set up PATH to use b
+lunch aosp_arm64
+
 test_target=//build/bazel/scripts/difftool:difftool
 
 b build "$test_target"