diff --git a/templates/dart/lib/src/client_browser.dart.twig b/templates/dart/lib/src/client_browser.dart.twig
index 652bd5059..c386af787 100644
--- a/templates/dart/lib/src/client_browser.dart.twig
+++ b/templates/dart/lib/src/client_browser.dart.twig
@@ -120,7 +120,7 @@ class ClientBrowser extends ClientBase with ClientMixin {
 
     while (offset < size) {
       var chunk;
-      final end = min(offset + CHUNK_SIZE - 1, size - 1);
+      final end = min(offset + CHUNK_SIZE, size);
       chunk = file.bytes!.getRange(offset, end).toList();
       params[paramName] =
           http.MultipartFile.fromBytes(paramName, chunk, filename: file.filename);
diff --git a/templates/dart/lib/src/client_io.dart.twig b/templates/dart/lib/src/client_io.dart.twig
index 1657d040a..bcacd2895 100644
--- a/templates/dart/lib/src/client_io.dart.twig
+++ b/templates/dart/lib/src/client_io.dart.twig
@@ -156,7 +156,7 @@ class ClientIO extends ClientBase with ClientMixin {
     while (offset < size) {
       List<int> chunk = [];
       if (file.bytes != null) {
-        final end = min(offset + CHUNK_SIZE - 1, size - 1);
+        final end = min(offset + CHUNK_SIZE, size);
         chunk = file.bytes!.getRange(offset, end).toList();
       } else {
         raf!.setPositionSync(offset);
diff --git a/templates/flutter/lib/src/client_browser.dart.twig b/templates/flutter/lib/src/client_browser.dart.twig
index 442a2fb02..52132bb9f 100644
--- a/templates/flutter/lib/src/client_browser.dart.twig
+++ b/templates/flutter/lib/src/client_browser.dart.twig
@@ -149,7 +149,7 @@ class ClientBrowser extends ClientBase with ClientMixin {
 
     while (offset < size) {
       var chunk;
-      final end = min(offset + CHUNK_SIZE - 1, size - 1);
+      final end = min(offset + CHUNK_SIZE, size);
       chunk = file.bytes!.getRange(offset, end).toList();
       params[paramName] =
           http.MultipartFile.fromBytes(paramName, chunk, filename: file.filename);
diff --git a/templates/flutter/lib/src/client_io.dart.twig b/templates/flutter/lib/src/client_io.dart.twig
index 4d17e99cb..585750759 100644
--- a/templates/flutter/lib/src/client_io.dart.twig
+++ b/templates/flutter/lib/src/client_io.dart.twig
@@ -276,7 +276,7 @@ class ClientIO extends ClientBase with ClientMixin {
     while (offset < size) {
       List<int> chunk = [];
       if (file.bytes != null) {
-        final end = min(offset + CHUNK_SIZE - 1, size - 1);
+        final end = min(offset + CHUNK_SIZE, size);
         chunk = file.bytes!.getRange(offset, end).toList();
       } else {
         raf!.setPositionSync(offset);