diff --git a/js/id/graph/relation.js b/js/id/graph/relation.js
index e7d4afd0a..a09d6dac0 100644
--- a/js/id/graph/relation.js
+++ b/js/id/graph/relation.js
@@ -140,7 +140,7 @@ _.extend(iD.Relation.prototype, {
             if (o !== undefined)
                 result[o].push(inners[i]);
             else
-                result.push(inners[i]); // Invalid geometry
+                result.push([inners[i]]); // Invalid geometry
         }
 
         return result;
diff --git a/test/spec/graph/relation.js b/test/spec/graph/relation.js
index f8b49a213..58b1767f4 100644
--- a/test/spec/graph/relation.js
+++ b/test/spec/graph/relation.js
@@ -298,6 +298,17 @@ describe('iD.Relation', function () {
             expect(r.multipolygon(graph)).to.eql([[[a, b, c, a], [d, e, f, d]], [[g, h, i, g]]]);
         });
 
+        specify("invalid geometry: unmatched inner", function () {
+            var a = iD.Node(),
+                b = iD.Node(),
+                c = iD.Node(),
+                w = iD.Way({nodes: [a.id, b.id, c.id, a.id]}),
+                r = iD.Relation({members: [{id: w.id, role: 'inner', type: 'way'}]}),
+                g = iD.Graph([a, b, c, w, r]);
+
+            expect(r.multipolygon(g)).to.eql([[[a, b, c, a]]]);
+        });
+
         specify("incomplete relation", function () {
             var a  = iD.Node(),
                 b  = iD.Node(),