diff --git a/src/OpenTelemetry.Exporter.Instana/CHANGELOG.md b/src/OpenTelemetry.Exporter.Instana/CHANGELOG.md
index edc969a77d..d1cf2c90c2 100644
--- a/src/OpenTelemetry.Exporter.Instana/CHANGELOG.md
+++ b/src/OpenTelemetry.Exporter.Instana/CHANGELOG.md
@@ -2,7 +2,12 @@
 
 ## Unreleased
 
+## 1.0.1 [2022-May-25]
+
+* Instana span duration was not calculated correctly
+[376](https://github.com/open-telemetry/opentelemetry-dotnet-contrib/pull/376)
+
 ## 1.0.0 [2022-May-24]
 
-This is the first release of the `OpenTelemetry.Exporter.Instana`
+* This is the first release of the `OpenTelemetry.Exporter.Instana`
 project.
diff --git a/src/OpenTelemetry.Exporter.Instana/Implementation/InstanaSpanSerializer.cs b/src/OpenTelemetry.Exporter.Instana/Implementation/InstanaSpanSerializer.cs
index 68bc0b8715..91fc38ca92 100644
--- a/src/OpenTelemetry.Exporter.Instana/Implementation/InstanaSpanSerializer.cs
+++ b/src/OpenTelemetry.Exporter.Instana/Implementation/InstanaSpanSerializer.cs
@@ -82,7 +82,7 @@ internal async Task SerializeToStreamWriterAsync(InstanaSpan instanaSpan, Stream
             await writer.WriteAsync(COMMA);
             await this.AppendPropertyAsync(DateToUnixMillis(instanaSpan.Ts), "ts", writer);
             await writer.WriteAsync(COMMA);
-            await this.AppendPropertyAsync(instanaSpan.D, "d", writer);
+            await this.AppendPropertyAsync((long)(instanaSpan.D / 10_000), "d", writer);
             await writer.WriteAsync(COMMA);
             await this.AppendObjectAsync(this.SerializeDataAsync, "data", instanaSpan, writer);
             await writer.WriteAsync(COMMA);