diff --git a/sdk/storage/Microsoft.Azure.WebJobs.Extensions.Storage.Common/src/Shared/Queues/QueueTargetScaler.cs b/sdk/storage/Microsoft.Azure.WebJobs.Extensions.Storage.Common/src/Shared/Queues/QueueTargetScaler.cs
index c5d207403333d..d89c8fab535a4 100644
--- a/sdk/storage/Microsoft.Azure.WebJobs.Extensions.Storage.Common/src/Shared/Queues/QueueTargetScaler.cs
+++ b/sdk/storage/Microsoft.Azure.WebJobs.Extensions.Storage.Common/src/Shared/Queues/QueueTargetScaler.cs
@@ -59,7 +59,7 @@ internal TargetScalerResult GetScaleResultInternal(TargetScalerContext context,
 
             if (concurrency < 0)
             {
-                throw new ArgumentOutOfRangeException($"Concurrency value='{concurrency}' used for target based scale must be > 0");
+                throw new ArgumentOutOfRangeException($"Concurrency value='{concurrency}' used for target based scale must be > 0.");
             }
 
             int targetWorkerCount = (int)Math.Ceiling(queueLength / (decimal)concurrency);