diff --git a/src/portable/nordic/nrf5x/dcd_nrf5x.c b/src/portable/nordic/nrf5x/dcd_nrf5x.c
index 2fe721d6b..bb07063d2 100644
--- a/src/portable/nordic/nrf5x/dcd_nrf5x.c
+++ b/src/portable/nordic/nrf5x/dcd_nrf5x.c
@@ -147,7 +147,7 @@ static void start_dma(volatile uint32_t* reg_startep) {
 
 static void edpt_dma_start(volatile uint32_t* reg_startep) {
   if (atomic_flag_test_and_set(&_dcd.dma_running)) {
-    usbd_defer_func((osal_task_func_t)(uintptr_t ) edpt_dma_start, (void*) (uintptr_t) reg_startep, true);
+    usbd_defer_func((osal_task_func_t)(uintptr_t ) edpt_dma_start, (void*) (uintptr_t) reg_startep, is_in_isr());
   } else {
     start_dma(reg_startep);
   }