diff --git a/chrome/content/zotero/feedSettings.xul b/chrome/content/zotero/feedSettings.xul
index 4e3fb3c929..3db65d8a4d 100644
--- a/chrome/content/zotero/feedSettings.xul
+++ b/chrome/content/zotero/feedSettings.xul
@@ -55,12 +55,12 @@
 			</hbox>
 			<hbox align="center">
 				<label value="&zotero.feedSettings.cleanupReadAfter.label1;" control="feed-cleanupReadAfter"/>
-				<textbox id="feed-cleanupReadAfter" type="number" min="0" increment="1" size="2"/>
+				<textbox id="feed-cleanupReadAfter" type="number" min="1" increment="1" size="2"/>
 				<label value="&zotero.feedSettings.cleanupReadAfter.label2;" control="feed-cleanupReadAfter"/>
 			</hbox>
 			<hbox align="center">
 				<label value="&zotero.feedSettings.cleanupUnreadAfter.label1;" control="feed-cleanupUnreadAfter"/>
-				<textbox id="feed-cleanupUnreadAfter" type="number" min="0" increment="1" size="2"/>
+				<textbox id="feed-cleanupUnreadAfter" type="number" min="1" increment="1" size="2"/>
 				<label value="&zotero.feedSettings.cleanupUnreadAfter.label2;" control="feed-cleanupUnreadAfter"/>
 			</hbox>
 		</vbox>
diff --git a/chrome/content/zotero/preferences/preferences_advanced.xul b/chrome/content/zotero/preferences/preferences_advanced.xul
index e555bee842..4ff7531ecd 100644
--- a/chrome/content/zotero/preferences/preferences_advanced.xul
+++ b/chrome/content/zotero/preferences/preferences_advanced.xul
@@ -313,14 +313,14 @@
 						<hbox>
 							<hbox align="center">
 								<label value="&zotero.feedSettings.cleanupReadAfter.label1;"/>
-								<textbox type="number" min="0" increment="1" size="2" preference="pref-feeds-defaultCleanupReadAfter"/>
+								<textbox type="number" min="1" increment="1" size="2" preference="pref-feeds-defaultCleanupReadAfter"/>
 								<label value="&zotero.feedSettings.cleanupReadAfter.label2;"/>
 							</hbox>
 						</hbox>
 						<hbox>
 							<hbox align="center">
 								<label value="&zotero.feedSettings.cleanupUnreadAfter.label1;"/>
-								<textbox type="number" min="0" increment="1" size="2" preference="pref-feeds-defaultCleanupUnreadAfter"/>
+								<textbox type="number" min="1" increment="1" size="2" preference="pref-feeds-defaultCleanupUnreadAfter"/>
 								<label value="&zotero.feedSettings.cleanupUnreadAfter.label2;"/>
 							</hbox>
 						</hbox>