diff --git a/tests/fc_script/estimate_difficulty.i b/tests/fc_script/estimate_difficulty.i
index 23b63dd6c5250076eb5eb8e74f0197b0bd9a12cc..68ee456b3a5a8850ca1b6dd8073e1c09a9a0cada 100644
--- a/tests/fc_script/estimate_difficulty.i
+++ b/tests/fc_script/estimate_difficulty.i
@@ -1,6 +1,7 @@
 /* run.config
    NOFRAMAC: testing frama-c-script, not frama-c itself
-   EXECNOW: LOG @PTEST_NAME@.res LOG @PTEST_NAME@.err PTESTS_TESTING=1 %{bin:frama-c-script} estimate-difficulty @PTEST_FILE@ > @PTEST_NAME@.res 2> @PTEST_NAME@.err
+   COMMENT: Disabled for now, when tests are executed in parallel, this test often fails
+   DONTRUN: EXECNOW: LOG @PTEST_NAME@.res LOG @PTEST_NAME@.err PTESTS_TESTING=1 %{bin:frama-c-script} estimate-difficulty @PTEST_FILE@ > @PTEST_NAME@.res 2> @PTEST_NAME@.err
 */
 
 // these includes are not actually used by the compiler