diff --git a/ports/esp32/mpconfigport.h b/ports/esp32/mpconfigport.h
index 866b1bc25c..723310b231 100644
--- a/ports/esp32/mpconfigport.h
+++ b/ports/esp32/mpconfigport.h
@@ -101,7 +101,10 @@
 #define MICROPY_PY_BLUETOOTH                (1)
 #define MICROPY_PY_BLUETOOTH_USE_SYNC_EVENTS (1)
 #define MICROPY_PY_BLUETOOTH_USE_SYNC_EVENTS_WITH_INTERLOCK (1)
-#define MICROPY_PY_BLUETOOTH_SYNC_EVENT_STACK_SIZE (CONFIG_BT_NIMBLE_TASK_STACK_SIZE - 2048)
+// Event stack size is the RTOS stack size minus an allowance for the stack used
+// by the NimBLE functions that call into invoke_irq_handler().
+// MICROPY_STACK_CHECK_MARGIN is further subtracted from this value to set the stack limit.
+#define MICROPY_PY_BLUETOOTH_SYNC_EVENT_STACK_SIZE (CONFIG_BT_NIMBLE_TASK_STACK_SIZE - 1024)
 #define MICROPY_PY_BLUETOOTH_ENABLE_CENTRAL_MODE (1)
 #define MICROPY_PY_BLUETOOTH_ENABLE_PAIRING_BONDING (1)
 #define MICROPY_BLUETOOTH_NIMBLE            (1)