diff --git a/os/hal/ports/STM32/LLD/FSMCv1/fsmc_sdram.c b/os/hal/ports/STM32/LLD/FSMCv1/fsmc_sdram.c
index 25da1792..e635323d 100644
--- a/os/hal/ports/STM32/LLD/FSMCv1/fsmc_sdram.c
+++ b/os/hal/ports/STM32/LLD/FSMCv1/fsmc_sdram.c
@@ -125,7 +125,7 @@ static void _sdram_init_sequence(const SDRAMConfig *cfgp) {
 
   /* Step 8: Set clock.*/
   _sdram_wait_ready();
-  SDRAMD.sdram->SDRTR = cfgp->sdrtr;
+  SDRAMD.sdram->SDRTR = cfgp->sdrtr & FMC_SDRTR_COUNT;
 
   _sdram_wait_ready();
 }