diff --git a/src/solver/parallel_tactical.cpp b/src/solver/parallel_tactical.cpp
index 4ba1b59d3e..753cd15496 100644
--- a/src/solver/parallel_tactical.cpp
+++ b/src/solver/parallel_tactical.cpp
@@ -1250,7 +1250,7 @@ class parallel_solver {
                     // re-checking the same cube would spin forever. Record a sound
                     // 'unknown' verdict and stop working this branch instead.
                     std::string reason = s->reason_unknown();
-                    if (reason != "max-conflicts-reached") {
+                    if (reason != "max-conflicts-reached" && reason != "sat.max.conflicts") {
                         LOG_WORKER(1, " undef cube is not conflict-limited (" << reason << "); reporting unknown\n");
                         b.set_unknown(reason);
                         return;