diff --git a/platformio.ini b/platformio.ini
index 152bb3e0..468e70db 100644
--- a/platformio.ini
+++ b/platformio.ini
@@ -60,5 +60,7 @@ build_flags =
     -DCORE_DEBUG_LEVEL=3
     -DHTTPS_LOGLEVEL=3
     -DHTTPS_REQUEST_MAX_REQUEST_LENGTH=1024
+    ; reduce probability of https://github.com/fhessel/esp32_https_server/pull/123
+    -DHTTPS_CONNECTION_DATA_CHUNK_SIZE=1024
     ; build number "-dev" will be replaced in github action
     -DBUILD_NUMBER=\"-dev\"