diff --git a/midend.c b/midend.c
index 0543830..1092a3b 100644
--- a/midend.c
+++ b/midend.c
@@ -309,6 +309,7 @@ void midend_free(midend *me)
     sfree(me->privdesc);
     sfree(me->seedstr);
     sfree(me->aux_info);
+    sfree(me->be_prefs.buf);
     me->ourgame->free_params(me->params);
     midend_free_preset_menu(me, me->preset_menu);
     if (me->ui)
@@ -3011,6 +3012,8 @@ static void midend_serialise_prefs(
 
         write(wctx, "\n", 1);
     }
+
+    free_cfg(cfg);
 }
 
 struct buffer {
diff --git a/solo.c b/solo.c
index 27ac7c9..2cfa0f3 100644
--- a/solo.c
+++ b/solo.c
@@ -2642,6 +2642,7 @@ static void solver(int cr, struct block_structure *blocks,
     sfree(usage->row);
     sfree(usage->col);
     sfree(usage->blk);
+    sfree(usage->diag);
     if (usage->kblocks) {
 	free_block_structure(usage->kblocks);
 	free_block_structure(usage->extra_cages);
@@ -2973,6 +2974,7 @@ static bool gridgen(int cr, struct block_structure *blocks,
     sfree(usage->blk);
     sfree(usage->col);
     sfree(usage->row);
+    sfree(usage->diag);
     sfree(usage);
 
     return ret;