diff --git a/arch/sparc32/romvec.c b/arch/sparc32/romvec.c
index 54a249e..9e4a92e 100644
--- a/arch/sparc32/romvec.c
+++ b/arch/sparc32/romvec.c
@@ -254,7 +254,7 @@ static int obp_nbputchar(int ch)
 
 static void obp_reboot(char *str)
 {
-    extern volatile unsigned char *reset_reg;
+    extern volatile unsigned int *reset_reg;
 
     printk("rebooting (%s)\n", str);
     *reset_reg = 1;
diff --git a/drivers/obio.c b/drivers/obio.c
index c88f265..b3bd967 100644
--- a/drivers/obio.c
+++ b/drivers/obio.c
@@ -1040,7 +1040,8 @@ ob_auxio_init(uint64_t base, uint64_t offset)
     fword("finish-device");
 }
 
-volatile unsigned char *power_reg, *reset_reg;
+volatile unsigned char *power_reg;
+volatile unsigned int *reset_reg;
 
 static void
 sparc32_reset_all(void)