diff --git a/matlab/tests_matlab.m b/matlab/tests_matlab.m
index 880442e572e662f34c5daa385ac80aaea7aa496f..1e976753384bc85c1278424ef9ff2f11be1cc881 100644
--- a/matlab/tests_matlab.m
+++ b/matlab/tests_matlab.m
@@ -5,7 +5,7 @@ try
    which interpos
    which interpos_nan
    ls /home/sauter/interpos/matlab
-   uname -a
+   !uname -a
    passed = true
    %passed = run_gdat_tests(test_case); % call to your test script here, with optional test_case input
    exit_code = int32(~passed); % convert to bash shell convention