diff --git a/os/hal/ports/STM32/LLD/BDMAv1/stm32_bdma.c b/os/hal/ports/STM32/LLD/BDMAv1/stm32_bdma.c
index 411a55b30..feadcaeb5 100644
--- a/os/hal/ports/STM32/LLD/BDMAv1/stm32_bdma.c
+++ b/os/hal/ports/STM32/LLD/BDMAv1/stm32_bdma.c
@@ -408,8 +408,8 @@ void bdmaStreamFreeI(const stm32_bdma_stream_t *stp) {
   bdma.allocated_mask &= ~(1U << stp->selfindex);
 
   /* Clearing associated handler and parameter.*/
-  bdma.streams->func  = NULL;
-  bdma.streams->param = NULL;
+  bdma.streams[stp->selfindex]->func  = NULL;
+  bdma.streams[stp->selfindex]->param = NULL;
 
   /* Shutting down clocks that are no more required, if any.*/
   if ((bdma.allocated_mask & STM32_BDMA_STREAMS_MASK) == 0U) {
diff --git a/readme.txt b/readme.txt
index 0ffc369ae..955e6e000 100644
--- a/readme.txt
+++ b/readme.txt
@@ -114,6 +114,8 @@
        instead of a simple size.
 - NEW: RT and NIL upgraded to support the enhanced OSLIB.
 - NEW: Memory areas/pointers checker functions added to OSLIB.
+- FIX: Fixed channel 0 corruption on STM32 BDMAv1 (bug #1263)
+       (backported to 20.3.5)(backported to 21.11.4).
 - FIX: Fixed wrong statistics in RT7 (bug #1262)(backported to 21.11.4).
 - FIX: Fixed missing cache management during Cortex-M RAM initializations
        (bug #1261)(backported to 20.3.5)(backported to 21.11.4).