diff --git a/request-processor.js b/request-processor.js
index d154c79..f60a7f8 100644
--- a/request-processor.js
+++ b/request-processor.js
@@ -242,7 +242,7 @@ function filterDataPeriod(data, fromSeconds, toSeconds) {
 		s = 'no_data';
 	}
 
-	toIndex = Math.min(fromIndex + 1000, toIndex); // do not send more than 1000 bars for server capacity reasons
+	fromIndex = Math.max(fromIndex, toIndex - 1000); // do not send more than 1000 bars for server capacity reasons
 
 	return {
 		t: data.t.slice(fromIndex, toIndex),