1 files changed, 1 insertions, 1 deletions

diff --git a/src/solve.c b/src/solve.c
index 0bd1de7..b9f5000 100644
--- a/src/solve.c
+++ b/src/solve.c
@@ -368,7 +368,7 @@ niss_makes_sense(DfsArg *arg)
         Cube testcube;
 
         testcube = apply_move(inverse_move(arg->last1), (Cube){0});
-        return arg->current_alg->len == 0 || arg->step->is_done(testcube);
+        return arg->current_alg->len == 0 || !arg->step->is_done(testcube);
 }
 
 static bool