diff --git a/browser/components/preferences/aboutPermissions.js b/browser/components/preferences/aboutPermissions.js
index 5f634c02a906..c9a9e12aeee2 100644
--- a/browser/components/preferences/aboutPermissions.js
+++ b/browser/components/preferences/aboutPermissions.js
@@ -425,6 +425,7 @@ let AboutPermissions = {
 
     gSitesStmt.finalize();
     gVisitStmt.finalize();
+    gPlacesDatabase.asyncClose(null);
   },
 
   observe: function (aSubject, aTopic, aData) {