diff --git a/index.js b/index.js
index 8365bf7..0350c76 100644
--- a/index.js
+++ b/index.js
@@ -255,7 +255,8 @@ function mapNets(nets) {
 }
 
 export function merge(nets) {
-  nets = uniq((Array.isArray(nets) ? nets : [nets]).map(parse));
+  // sort to workaround https://github.com/silverwind/cidr-tools/issues/17
+  nets = uniq((Array.isArray(nets) ? nets : [nets]).sort(compare).map(parse));
   const maps = mapNets(nets);
 
   const merged = {4: [], 6: []};
diff --git a/index.test.js b/index.test.js
index e10703a..bddcd38 100644
--- a/index.test.js
+++ b/index.test.js
@@ -25,6 +25,9 @@ test("merge", () => {
   expect(merge(["0.0.1.0/24", "0.0.2.0/24", "0.0.3.0/24", "0.0.4.0/24"])).toEqual(["0.0.1.0/24", "0.0.2.0/23", "0.0.4.0/24"]);
   expect(merge(["0.0.175.0/24", "0.0.176.0/21", "0.0.184.0/21", "0.0.192.0/24"])).toEqual(["0.0.175.0/24", "0.0.176.0/20", "0.0.192.0/24"]);
   expect(merge(["0.0.176.0/21", "0.0.184.0/21", "0.0.192.0/24"])).toEqual(["0.0.176.0/20", "0.0.192.0/24"]);
+  expect(merge(["1:1:1:1::/128", "1:1:1:2::/128"])).toEqual(["1:1:1:1::/128", "1:1:1:2::/128"]);
+  expect(merge(["::2:0:0/128", "::1:0:0/128"])).toEqual(["::1:0:0/128", "::2:0:0/128"]);
+  expect(merge(["::2:0:0/128", "::1:0:0/128", "::2:0:1/128"])).toEqual(["::1:0:0/128", "::2:0:0/127"]);
 });
 
 test("exclude", () => {