src/testing.cc |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/src/testing.cc b/src/testing.cc
index f767bf6..097b9b9 100644
--- a/src/testing.cc
+++ b/src/testing.cc
@@ -86,6 +86,8 @@ std::string greg_test(const std::string &file_name) {
    const char *c = getenv("COOT_TEST_DATA_DIR");
    if (c) {
       dd = c;
+      dd += "/";
+      dd += file_name;
    } else { 
       const char *d = getenv("HOME");
       if (d) {