diff --git a/drivers/dma/dma_stm32.h b/drivers/dma/dma_stm32.h
index 363677509ef..d649679e536 100644
--- a/drivers/dma/dma_stm32.h
+++ b/drivers/dma/dma_stm32.h
@@ -16,7 +16,7 @@ struct dma_stm32_stream {
 	int mux_channel; /* stores the dmamux channel */
 #endif /* CONFIG_DMAMUX_STM32 */
 	bool source_periph;
-	bool busy;
+	volatile bool busy;
 	uint32_t src_size;
 	uint32_t dst_size;
 	void *user_data; /* holds the client data */