diff --git a/platformio.ini b/platformio.ini
index 9793c32d25..105186e9c2 100644
--- a/platformio.ini
+++ b/platformio.ini
@@ -82,13 +82,19 @@ extends = arduino_base
 platform = nordicnrf52
 platform_packages =
   ; fork that includes patch to ble stack to prevent firmware lockup during rapid connect/disconnect (PRs #1177, #1295)
-  ; plus LittleFS v1.7.2 upgrade
-  framework-arduinoadafruitnrf52 @ https://github.com/weebl2000/Adafruit_nRF52_Arduino.git#724e00a76e74132a8e30097e96ad4e27c4547b12 ; 1.10700.1
+  ; plus LittleFS v1.7.2 upgrade, plus #ifndef guard so LOOP_STACK_SZ (below) is overridable
+  ; (PR weebl2000/Adafruit_nRF52_Arduino#1 -- repin to weebl2000 once merged & tagged)
+  framework-arduinoadafruitnrf52 @ https://github.com/disq/Adafruit_nRF52_Arduino.git#f019297fa2c09a3484b482b144e7b187f4226044
 extra_scripts = create-uf2.py
 build_flags = ${arduino_base.build_flags}
   -D NRF52_PLATFORM
   -D LFS_NO_ASSERT=1
   -D EXTRAFS=1
+  ; Enlarge the Arduino loop_task stack (framework default 4KB / 1024 words is too
+  ; small for LittleFS file opens from loop(), which overflow it and corrupt adjacent
+  ; heap). 2048 words = 8KB. Requires the framework's LOOP_STACK_SZ #define to be
+  ; #ifndef-guarded (Adafruit_nRF52_Arduino) so this override is honoured.
+  -D LOOP_STACK_SZ=2048
 lib_deps =
   ${arduino_base.lib_deps}
   https://github.com/oltaco/CustomLFS#0.2.2