diff --git a/modules/osm/relation.js b/modules/osm/relation.js
index 2af55cabe..2c33b7b0c 100644
--- a/modules/osm/relation.js
+++ b/modules/osm/relation.js
@@ -308,8 +308,9 @@ Object.assign(osmRelation.prototype, {
         inners = osmJoinWays(inners, resolver);
 
         var sequenceToLineString = function(sequence) {
-            if (sequence.nodes[0] !== sequence.nodes[sequence.nodes.length - 1]) {
-                // treat all parts as closed even if they aren't
+            if (sequence.nodes.length > 2 &&
+                sequence.nodes[0] !== sequence.nodes[sequence.nodes.length - 1]) {
+                // close unclosed parts to ensure correct area rendering - #2945
                 sequence.nodes.push(sequence.nodes[0]);
             }
             return sequence.nodes.map(function(node) { return node.loc; });
diff --git a/test/spec/osm/relation.js b/test/spec/osm/relation.js
index e0810eef6..42d40a02c 100644
--- a/test/spec/osm/relation.js
+++ b/test/spec/osm/relation.js
@@ -647,7 +647,7 @@ describe('iD.osmRelation', function () {
             var r = iD.osmRelation({members: [{id: w.id, type: 'way'}]});
             var g = iD.coreGraph([a, b, c, w, r]);
 
-            expect(r.multipolygon(g)).to.eql([[[a.loc, b.loc, c.loc]]]);
+            expect(r.multipolygon(g)).to.eql([[[a.loc, b.loc, c.loc, a.loc]]]);
         });
 
         specify('invalid geometry: unclosed ring consisting of multiple ways', function () {
@@ -659,7 +659,7 @@ describe('iD.osmRelation', function () {
             var r  = iD.osmRelation({members: [{id: w1.id, type: 'way'}, {id: w2.id, type: 'way'}]});
             var g  = iD.coreGraph([a, b, c, w1, w2, r]);
 
-            expect(r.multipolygon(g)).to.eql([[[a.loc, b.loc, c.loc]]]);
+            expect(r.multipolygon(g)).to.eql([[[a.loc, b.loc, c.loc, a.loc]]]);
         });
 
         specify('invalid geometry: unclosed ring consisting of multiple ways, alternate order', function () {
@@ -672,7 +672,7 @@ describe('iD.osmRelation', function () {
             var r  = iD.osmRelation({members: [{id: w1.id, type: 'way'}, {id: w2.id, type: 'way'}]});
             var g  = iD.coreGraph([a, b, c, d, w1, w2, r]);
 
-            expect(r.multipolygon(g)).to.eql([[[d.loc, c.loc, b.loc, a.loc]]]);
+            expect(r.multipolygon(g)).to.eql([[[d.loc, c.loc, b.loc, a.loc, d.loc]]]);
         });
 
         specify('invalid geometry: unclosed ring consisting of multiple ways, one needing reversal', function () {
@@ -685,7 +685,7 @@ describe('iD.osmRelation', function () {
             var r  = iD.osmRelation({members: [{id: w1.id, type: 'way'}, {id: w2.id, type: 'way'}]});
             var g  = iD.coreGraph([a, b, c, d, w1, w2, r]);
 
-            expect(r.multipolygon(g)).to.eql([[[d.loc, c.loc, b.loc, a.loc]]]);
+            expect(r.multipolygon(g)).to.eql([[[a.loc, d.loc, c.loc, b.loc, a.loc]]]);
         });
 
         specify('invalid geometry: unclosed ring consisting of multiple ways, one needing reversal, alternate order', function () {
@@ -698,7 +698,7 @@ describe('iD.osmRelation', function () {
             var r  = iD.osmRelation({members: [{id: w1.id, type: 'way'}, {id: w2.id, type: 'way'}]});
             var g  = iD.coreGraph([a, b, c, d, w1, w2, r]);
 
-            expect(r.multipolygon(g)).to.eql([[[d.loc, c.loc, b.loc, a.loc]]]);
+            expect(r.multipolygon(g)).to.eql([[[d.loc, c.loc, b.loc, a.loc, d.loc]]]);
         });
 
         specify('single polygon with single single-way inner', function () {
@@ -805,7 +805,7 @@ describe('iD.osmRelation', function () {
             var r  = iD.osmRelation({members: [{id: w2.id, type: 'way'}, {id: w1.id, type: 'way'}]});
             var g  = iD.coreGraph([a, b, c, w1, r]);
 
-            expect(r.multipolygon(g)).to.eql([[[a.loc, b.loc, c.loc]]]);
+            expect(r.multipolygon(g)).to.eql([[[a.loc, c.loc, b.loc, a.loc]]]);
         });
     });