diff --git a/ports/stm32/dma.c b/ports/stm32/dma.c
index 7ea2eaa3b4..35cfba162e 100644
--- a/ports/stm32/dma.c
+++ b/ports/stm32/dma.c
@@ -498,6 +498,14 @@ void dma_init(DMA_HandleTypeDef *dma, const dma_descr_t *dma_descr, void *data){
 
         dma_enable_clock(dma_id);
 
+        #if defined(STM32L4)
+        // Always reset and configure the L4 DMA peripheral
+        // (dma->State is set to HAL_DMA_STATE_RESET by memset above)
+        // TODO: understand how L4 DMA works so this is not needed
+        HAL_DMA_DeInit(dma);
+        HAL_DMA_Init(dma);
+        HAL_NVIC_SetPriority(dma_irqn[dma_id], IRQ_PRI_DMA, IRQ_SUBPRI_DMA);
+        #else
         // if this stream was previously configured for this channel/request then we
         // can skip most of the initialisation
         uint8_t sub_inst = DMA_SUB_INSTANCE_AS_UINT8(dma_descr->sub_instance);
@@ -518,6 +526,7 @@ void dma_init(DMA_HandleTypeDef *dma, const dma_descr_t *dma_descr, void *data){
             DMA_CalcBaseAndBitshift(dma);
 #endif
         }
+        #endif
 
         HAL_NVIC_EnableIRQ(dma_irqn[dma_id]);
     }