diff --git a/CHANGELOG.md b/CHANGELOG.md
index ad5c780983..ee112f73dd 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -14,6 +14,7 @@ For experimental package changes, see the [experimental CHANGELOG](experimental/
 ### :bug: (Bug Fix)
 
 * fix(sdk-metrics): allow instrument names to contain '/' [#4155](https://github.com/open-telemetry/opentelemetry-js/pull/4155)
+* fix(exporter-zipkin): round duration to the nearest int in annotations to be compliant with zipkin protocol [#4167](https://github.com/open-telemetry/opentelemetry-js/pull/4167) @FelipeEmerim
 
 ### :books: (Refine Doc)
 
diff --git a/packages/opentelemetry-exporter-zipkin/src/transform.ts b/packages/opentelemetry-exporter-zipkin/src/transform.ts
index 54392321f8..06fbe5973a 100644
--- a/packages/opentelemetry-exporter-zipkin/src/transform.ts
+++ b/packages/opentelemetry-exporter-zipkin/src/transform.ts
@@ -111,7 +111,7 @@ export function _toZipkinAnnotations(
   events: TimedEvent[]
 ): zipkinTypes.Annotation[] {
   return events.map(event => ({
-    timestamp: hrTimeToMicroseconds(event.time),
+    timestamp: Math.round(hrTimeToMicroseconds(event.time)),
     value: event.name,
   }));
 }
diff --git a/packages/opentelemetry-exporter-zipkin/test/common/transform.test.ts b/packages/opentelemetry-exporter-zipkin/test/common/transform.test.ts
index 810b9e32f9..4df7f73f6c 100644
--- a/packages/opentelemetry-exporter-zipkin/test/common/transform.test.ts
+++ b/packages/opentelemetry-exporter-zipkin/test/common/transform.test.ts
@@ -82,7 +82,7 @@ describe('transform', () => {
         annotations: [
           {
             value: 'my-event',
-            timestamp: hrTimeToMicroseconds(span.events[0].time),
+            timestamp: Math.round(hrTimeToMicroseconds(span.events[0].time)),
           },
         ],
         duration: Math.round(
@@ -329,11 +329,11 @@ describe('transform', () => {
       assert.deepStrictEqual(annotations, [
         {
           value: 'my-event1',
-          timestamp: hrTimeToMicroseconds(span.events[0].time),
+          timestamp: Math.round(hrTimeToMicroseconds(span.events[0].time)),
         },
         {
           value: 'my-event2',
-          timestamp: hrTimeToMicroseconds(span.events[1].time),
+          timestamp: Math.round(hrTimeToMicroseconds(span.events[1].time)),
         },
       ]);
     });