diff --git a/assets/javascript/ajax.js b/assets/javascript/ajax.js
index 9855381e5..90e6f206f 100644
--- a/assets/javascript/ajax.js
+++ b/assets/javascript/ajax.js
@@ -67,6 +67,23 @@
 			$contribList = $('.contrib-list-container'),
 			$search = $('#category-search');
 
+		// The address is about to change directory depth, which would make the
+		// browser re-resolve every relative URL on the page against the new
+		// path. Pin them to the URL the document was rendered against first.
+		var resolver = document.createElement('a');
+		$('a[href], form[action]').each(function() {
+			var name = (this.nodeName === 'FORM') ? 'action' : 'href',
+				value = this.getAttribute(name);
+
+			// Skip absolute URLs, protocol-relative URLs, root-relative URLs, and in-page anchors.
+			if (!value || value[0] === '#' || value[0] === '/' || value.indexOf('//') === 0 || /^[a-zA-Z][a-zA-Z0-9+.-]*:/.test(value)) {
+				return;
+			}
+
+			resolver.href = value;
+			this.setAttribute(name, resolver.href);
+		});
+
 		phpbb.history.replaceUrl($this.attr('href'));
 
 		var getParents = function($self) {