diff --git a/src/url/url_canon_ip.cc b/src/url/url_canon_ip.cc
index 4a98592012..0bfbe4e86a 100644
--- a/src/url/url_canon_ip.cc
+++ b/src/url/url_canon_ip.cc
@@ -149,7 +149,10 @@ CanonHostInfo::Family DoIPv4AddressToNumber(const CHAR* spec,
   while (true) {
     // If this is not the first character of a component, go to the next
     // component.
-    if (current_position != host.begin && spec[current_position - 1] != '.') {
+    // XXX: On mips64el, using
+    // `current_position != host.begin && spec[current_position - 1] != '.'`
+    // would have current_position going to the negative.
+    if (current_position > host.begin && spec[current_position - 1] != '.') {
       --current_position;
       continue;
     }