diff --git a/src/wuttaweb/templates/configure.mako b/src/wuttaweb/templates/configure.mako
index 20878a3..63ba963 100644
--- a/src/wuttaweb/templates/configure.mako
+++ b/src/wuttaweb/templates/configure.mako
@@ -190,7 +190,7 @@
 
     // cf. https://stackoverflow.com/a/56551646
     ThisPage.methods.beforeWindowUnload = function(e) {
-        if (this.settingsNeedSaved && !this.savingSettings && !this.undoChanges) {
+        if (this.settingsNeedSaved && !this.savingSettings && !this.undoChanges && !this.purgingSettings) {
             e.preventDefault()
             e.returnValue = ''
         }