diff --git a/signpost.c b/signpost.c
index aa2e13a..2e2dff2 100644
--- a/signpost.c
+++ b/signpost.c
@@ -284,7 +284,7 @@ static int check_nums(game_state *orig, game_state *copy, int only_immutable)
     int i, ret = 1;
     assert(copy->n == orig->n);
     for (i = 0; i < copy->n; i++) {
-        if (only_immutable && !copy->flags[i] & FLAG_IMMUTABLE) continue;
+        if (only_immutable && !(copy->flags[i] & FLAG_IMMUTABLE)) continue;
         assert(copy->nums[i] >= 0);
         assert(copy->nums[i] <= copy->n);
         if (copy->nums[i] != orig->nums[i]) {
diff --git a/tracks.c b/tracks.c
index 5b27350..ca44ce1 100644
--- a/tracks.c
+++ b/tracks.c
@@ -1072,7 +1072,7 @@ static int solve_check_single_sub(game_state *state, int si, int id, int n,
         x = i%w;
         y = i/w;
         if (abs(ox-x) > 1 || abs(oy-y) > 1) {
-            if (!state->sflags[i] & S_TRACK)
+            if (!(state->sflags[i] & S_TRACK))
                 did += solve_set_sflag(state, x, y, S_NOTRACK, what);
         }
     }