diff --git a/litex/soc/software/libbase/memtest.c b/litex/soc/software/libbase/memtest.c
index df528d55d..2fd5aedcb 100644
--- a/litex/soc/software/libbase/memtest.c
+++ b/litex/soc/software/libbase/memtest.c
@@ -164,7 +164,7 @@ int memtest_data(unsigned int *addr, unsigned long size, int random)
 
 void memspeed(unsigned int *addr, unsigned long size, bool read_only)
 {
-	volatile unsigned int *array = addr;
+	volatile unsigned long *array = (unsigned long *)addr;
 	int i;
 	unsigned int start, end;
 	unsigned long write_speed = 0;