diff --git a/lib/web3/contract.js b/lib/web3/contract.js
index 334f74f..d803faf 100644
--- a/lib/web3/contract.js
+++ b/lib/web3/contract.js
@@ -136,7 +136,7 @@ var addEventRelatedPropertiesToContract = function (contract, desc, address) {
         return parser(data);
     };
     
-    Object.defineProperty(contract, 'topic', {
+    Object.defineProperty(contract, 'topics', {
         get: function() {
             return utils.filterEvents(desc).map(function (e) {
                 return signature.eventSignatureFromAscii(e.name);
diff --git a/lib/web3/event.js b/lib/web3/event.js
index 1918172..1582270 100644
--- a/lib/web3/event.js
+++ b/lib/web3/event.js
@@ -67,10 +67,10 @@ var inputParser = function (address, sign, event) {
     return function (indexed, options) {
         var o = options || {};
         o.address = address;
-        o.topic = [];
-        o.topic.push(sign);
+        o.topics = [];
+        o.topics.push(sign);
         if (indexed) {
-            o.topic = o.topic.concat(indexedParamsToTopics(event, indexed));
+            o.topics = o.topics.concat(indexedParamsToTopics(event, indexed));
         }
         return o;
     };
@@ -102,12 +102,12 @@ var outputParser = function (event) {
         };
 
         output.topics = output.topic; // fallback for go-ethereum
-        if (!output.topic) {
+        if (!output.topics) {
             return result;
         }
        
         var indexedOutputs = filterInputs(event.inputs, true);
-        var indexedData = "0x" + output.topic.slice(1, output.topic.length).map(function (topic) { return topic.slice(2); }).join("");
+        var indexedData = "0x" + output.topics.slice(1, output.topics.length).map(function (topics) { return topics.slice(2); }).join("");
         var indexedRes = abi.formatOutput(indexedOutputs, indexedData);
 
         var notIndexedOutputs = filterInputs(event.inputs, false);
@@ -122,7 +122,7 @@ var outputParser = function (event) {
 var getMatchingEvent = function (events, payload) {
     for (var i = 0; i < events.length; i++) {
         var sign = signature.eventSignatureFromAscii(events[i].name); 
-        if (sign === payload.topic[0]) {
+        if (sign === payload.topics[0]) {
             return events[i];
         }
     }
diff --git a/lib/web3/formatters.js b/lib/web3/formatters.js
index 8a61042..812838e 100644
--- a/lib/web3/formatters.js
+++ b/lib/web3/formatters.js
@@ -145,12 +145,12 @@ var inputPostFormatter = function(post){
     post.ttl = utils.fromDecimal(post.ttl);
     post.workToProve = utils.fromDecimal(post.workToProve);
 
-    if(!(post.topic instanceof Array))
-        post.topic = [post.topic];
+    if(!(post.topics instanceof Array))
+        post.topics = [post.topics];
 
 
     // format the following options
-    post.topic = post.topic.map(function(topic){
+    post.topics = post.topics.map(function(topic){
         return utils.fromAscii(topic);
     });
 
@@ -179,7 +179,7 @@ var outputPostFormatter = function(post){
     }
 
     // format the following options
-    post.topic = post.topic.map(function(topic){
+    post.topics = post.topics.map(function(topic){
         return utils.toAscii(topic);
     });
 
diff --git a/test/event.inputParser.js b/test/event.inputParser.js
index b2e4bc7..a2ce271 100644
--- a/test/event.inputParser.js
+++ b/test/event.inputParser.js
@@ -20,8 +20,8 @@ describe('event', function () {
 
             // then
             assert.equal(result.address, address); 
-            assert.equal(result.topic.length, 1);
-            assert.equal(result.topic[0], signature);
+            assert.equal(result.topics.length, 1);
+            assert.equal(result.topics[0], signature);
 
         });
 
@@ -47,8 +47,8 @@ describe('event', function () {
 
             // then
             assert.equal(result.address, address);
-            assert.equal(result.topic.length, 1);
-            assert.equal(result.topic[0], signature);
+            assert.equal(result.topics.length, 1);
+            assert.equal(result.topics[0], signature);
             assert.equal(result.fromBlock, options.fromBlock);
             assert.equal(result.toBlock, options.toBlock);
             assert.equal(result.offset, options.offset);
@@ -78,9 +78,9 @@ describe('event', function () {
 
             // then
             assert.equal(result.address, address);
-            assert.equal(result.topic.length, 2);
-            assert.equal(result.topic[0], signature);
-            assert.equal(result.topic[1], f.formatInputInt(4));
+            assert.equal(result.topics.length, 2);
+            assert.equal(result.topics[0], signature);
+            assert.equal(result.topics[1], f.formatInputInt(4));
             assert.equal(result.fromBlock, options.fromBlock);
             assert.equal(result.toBlock, options.toBlock);
             assert.equal(result.offset, options.offset);
@@ -110,10 +110,10 @@ describe('event', function () {
 
             // then
             assert.equal(result.address, address);
-            assert.equal(result.topic.length, 2);
-            assert.equal(result.topic[0], signature);
-            assert.equal(result.topic[1][0], f.formatInputInt(4));
-            assert.equal(result.topic[1][1], f.formatInputInt(69));
+            assert.equal(result.topics.length, 2);
+            assert.equal(result.topics[0], signature);
+            assert.equal(result.topics[1][0], f.formatInputInt(4));
+            assert.equal(result.topics[1][1], f.formatInputInt(69));
             assert.equal(result.earliest, options.earliest);
             assert.equal(result.latest, options.latest);
             assert.equal(result.offset, options.offset);
diff --git a/test/formatters.inputPostFormatter.js b/test/formatters.inputPostFormatter.js
index d40bede..d9bf9d6 100644
--- a/test/formatters.inputPostFormatter.js
+++ b/test/formatters.inputPostFormatter.js
@@ -13,14 +13,14 @@ describe('formatters', function () {
                 payload: {test: 'test'},
                 ttl: 200,
                 workToProve: 1000,
-                topic: ['hello','mytopics']
+                topics: ['hello','mytopics']
             }), {
                 from: '0x00000',
                 to: '0x00000',
                 payload: '0x7b2274657374223a2274657374227d',
                 ttl: '0xc8',
                 workToProve: '0x3e8',
-                topic: ['0x68656c6c6f','0x6d79746f70696373']
+                topics: ['0x68656c6c6f','0x6d79746f70696373']
             });
 
         });
diff --git a/test/formatters.outputPostFormatter.js b/test/formatters.outputPostFormatter.js
index 80d37ae..2d49721 100644
--- a/test/formatters.outputPostFormatter.js
+++ b/test/formatters.outputPostFormatter.js
@@ -10,14 +10,14 @@ describe('formatters', function () {
                 sent: '0x3e8',
                 ttl: '0x3e8',
                 payload: '0x7b2274657374223a2274657374227d',
-                topic: ['0x68656c6c6f','0x6d79746f70696373']                
+                topics: ['0x68656c6c6f','0x6d79746f70696373']                
             }), {
                 expiry: 1000,
                 sent: 1000,
                 ttl: 1000,
                 payload: {test: 'test'},
                 payloadRaw: '0x7b2274657374223a2274657374227d',
-                topic: ['hello','mytopics']
+                topics: ['hello','mytopics']
             });
         });
     });