diff --git a/internal/services/streamanalytics/stream_analytics_output_blob_resource.go b/internal/services/streamanalytics/stream_analytics_output_blob_resource.go
index 29d98da88d35..fe8b55f9db97 100644
--- a/internal/services/streamanalytics/stream_analytics_output_blob_resource.go
+++ b/internal/services/streamanalytics/stream_analytics_output_blob_resource.go
@@ -181,7 +181,7 @@ func resourceStreamAnalyticsOutputBlobCreateUpdate(d *pluginsdk.ResourceData, me
 	}
 
 	if batchMinRows, ok := d.GetOk("batch_min_rows"); ok {
-		props.Properties.SizeWindow = utils.Int64(batchMinRows.(int64))
+		props.Properties.SizeWindow = utils.Int64(int64(batchMinRows.(int)))
 	}
 
 	// timeWindow and sizeWindow must be set for Parquet serialization