diff --git a/src/OpenTelemetry.Exporter.OpenTelemetryProtocol/Implementation/OtlpCommonExtensions.cs b/src/OpenTelemetry.Exporter.OpenTelemetryProtocol/Implementation/OtlpCommonExtensions.cs
index 4275f765cc2..43a1d220c34 100644
--- a/src/OpenTelemetry.Exporter.OpenTelemetryProtocol/Implementation/OtlpCommonExtensions.cs
+++ b/src/OpenTelemetry.Exporter.OpenTelemetryProtocol/Implementation/OtlpCommonExtensions.cs
@@ -83,7 +83,7 @@ public static OtlpCommon.KeyValue ToOtlpAttribute(this KeyValuePair<string, obje
                         case uint[]:
                         case long[]:
 #if NETSTANDARD || NETFRAMEWORK
-                            if (array is nint[])
+                            if (!(array is long[]) && array is nint[])
                             {
                                 return null;
                             }