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-rw-r--r--libmaple/systick.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/libmaple/systick.c b/libmaple/systick.c
index 103893e..c04f4f3 100644
--- a/libmaple/systick.c
+++ b/libmaple/systick.c
@@ -28,7 +28,7 @@
#include "systick.h"
-__io uint32 systick_timer_millis;
+volatile uint32 systick_timer_millis;
/**
* @brief Initialize and enable SysTick.