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-rw-r--r--timer.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/timer.h b/timer.h
index 8ddf9e7e2..2dfa08a0f 100644
--- a/timer.h
+++ b/timer.h
@@ -6,7 +6,7 @@
#define TIMER_DIFF(a, b) ((a) >= (b) ? (a) - (b) : UINT16_MAX - (b) + (a))
-extern uint16_t timer_count;
+extern volatile uint16_t timer_count;
void timer_init(void);