diff --git a/abstract-machine/am/src/platform/nemu/ioe/timer.c b/abstract-machine/am/src/platform/nemu/ioe/timer.c
index 251c31f..a22c539 100644
--- a/abstract-machine/am/src/platform/nemu/ioe/timer.c
+++ b/abstract-machine/am/src/platform/nemu/ioe/timer.c
@@ -18,7 +18,7 @@ void __am_timer_init() {
 
 void __am_timer_uptime(AM_TIMER_UPTIME_T *uptime) {
   (*(volatile AM_TIMER_UPTIME_T *)uptime).us = GET_TIME() - __timer_start;
-    PNT_BITS(uptime->us);
+  PNT_BITS(uptime->us);
 }
 
 void __am_timer_rtc(AM_TIMER_RTC_T *rtc) {
diff --git a/abstract-machine/klib/include/klib-macros.h b/abstract-machine/klib/include/klib-macros.h
index 1f7c370..7789f86 100644
--- a/abstract-machine/klib/include/klib-macros.h
+++ b/abstract-machine/klib/include/klib-macros.h
@@ -16,8 +16,8 @@
   ({ for (const char *p = s; *p; p++) putch(*p); })
 
 #define io_read(reg) \
-  ({ reg##_T __io_param; \
-    ioe_read(reg, &__io_param); \
+  ({ volatile reg##_T __io_param; \
+    ioe_read(reg, (void*)&__io_param); \
     __io_param; })
 
 #define io_write(reg, ...) \