diff --git a/html/inc/boinc_db.inc b/html/inc/boinc_db.inc
index ff3b4c20d4..9c0d328621 100644
--- a/html/inc/boinc_db.inc
+++ b/html/inc/boinc_db.inc
@@ -108,7 +108,7 @@ class BoincDb {
             if (self::$dbnum == $dbnum) {
                 return self::$instance;
             }
-            close();
+            self::close();
         }
         if (web_stopped()) {
             if ($generating_xml) {
diff --git a/html/ops/db_update.php b/html/ops/db_update.php
index 509eb10fcf..943d66521d 100644
--- a/html/ops/db_update.php
+++ b/html/ops/db_update.php
@@ -22,9 +22,9 @@
 $cli_only = true;
 require_once("../inc/util_ops.inc");
 
-$db = BoincDb::get_aux(false);
+$db = BoincDb::get(0);
 if (!$db) {
-    echo "Can't open database\n";
+    echo "db_update.php: Can't open database\n";
     exit;
 }
 
diff --git a/sched/plan_class_spec.cpp b/sched/plan_class_spec.cpp
index da66de9c90..5b93ef2d0e 100644
--- a/sched/plan_class_spec.cpp
+++ b/sched/plan_class_spec.cpp
@@ -157,6 +157,8 @@ static bool wu_is_infeasible_for_plan_class(
     return false;
 }
 
+// parse plan_class_spec.xml
+//
 int PLAN_CLASS_SPECS::parse_file(const char* path) {
     FILE* f = boinc::fopen(path, "r");
     if (!f) return ERR_FOPEN;
@@ -544,7 +546,7 @@ bool PLAN_CLASS_SPEC::check(
     }
 
     if (wsl) {
-        if (!sreq.host.wsl_available) {
+        if (sreq.host.wsl_distros.distros.empty()) {
             add_no_work_message("WSL is not available on this host");
             return false;
         }
@@ -1106,6 +1108,7 @@ int PLAN_CLASS_SPEC::parse(XML_PARSER& xp) {
         if (xp.parse_bool("cal", cal)) continue;
         if (xp.parse_bool("opencl", opencl)) continue;
         if (xp.parse_bool("virtualbox", virtualbox)) continue;
+        if (xp.parse_bool("wsl", wsl)) continue;
         if (xp.parse_bool("is64bit", is64bit)) continue;
         if (xp.parse_str("cpu_feature", buf, sizeof(buf))) {
             cpu_features.push_back(" " + (string)buf + " ");
@@ -1244,7 +1247,6 @@ int PLAN_CLASS_SPECS::parse_specs(FILE* f) {
     return ERR_XML_PARSE;
 }
 
-
 PLAN_CLASS_SPEC::PLAN_CLASS_SPEC() {
     strcpy(name, "");
     strcpy(gpu_type, "");
@@ -1252,6 +1254,7 @@ PLAN_CLASS_SPEC::PLAN_CLASS_SPEC() {
     cal = false;
     opencl = false;
     virtualbox = false;
+    wsl = false;
     is64bit = false;
     min_ncpus = 0;
     max_threads = 1;