diff --git a/litex/soc/software/liblitedram/bist.c b/litex/soc/software/liblitedram/bist.c
index 3add89c1b..f2079224d 100644
--- a/litex/soc/software/liblitedram/bist.c
+++ b/litex/soc/software/liblitedram/bist.c
@@ -131,7 +131,7 @@ void sdram_bist_loop(uint32_t loop, uint32_t burst_length, uint32_t random) {
 static uint32_t compute_speed_mibs(uint32_t length, uint32_t ticks) {
 	uint32_t speed;
 	//printf("(%u, %u)", length, ticks);
-	speed = length*(CONFIG_CLOCK_FREQUENCY/(1024*1024))/ticks;
+	speed = (uint64_t)length*(CONFIG_CLOCK_FREQUENCY/(1024*1024))/ticks;
 	return speed;
 }