diff --git a/packages/minimongo/minimongo_tests.js b/packages/minimongo/minimongo_tests.js
index 706907c6e99..d1629e40f8b 100644
--- a/packages/minimongo/minimongo_tests.js
+++ b/packages/minimongo/minimongo_tests.js
@@ -798,6 +798,7 @@ Tinytest.add("minimongo - selector_compiler", function (test) {
   match({"dogs.0.name": "Fido"}, {dogs: [{name: "Fido"}, {name: "Rex"}]});
   match({"dogs.1.name": "Rex"}, {dogs: [{name: "Fido"}, {name: "Rex"}]});
   nomatch({"dogs.1.name": "Fido"}, {dogs: [{name: "Fido"}, {name: "Rex"}]});
+  match({"room.1b": "bla"}, {room: {"1b": "bla"}});
 
   // XXX still needs tests:
   // - $elemMatch
diff --git a/packages/minimongo/selector.js b/packages/minimongo/selector.js
index e462b5e6113..4d4e33c6b3b 100644
--- a/packages/minimongo/selector.js
+++ b/packages/minimongo/selector.js
@@ -398,7 +398,7 @@ LocalCollection._exprForKeypathPredicate = function (keypath, value, literals) {
   while (keyparts.length) {
     var part = keyparts.pop();
     var thisPartIsNumber = false;
-    if (/^\d+/.test(part)) {
+    if (/^\d+$/.test(part)) {
       part = +part;
       thisPartIsNumber = true;
     }