diff --git a/firmware/main.c b/firmware/main.c
index 49d24c4..95c8f69 100644
--- a/firmware/main.c
+++ b/firmware/main.c
@@ -1851,7 +1851,7 @@ extern uint8_t _start__stack[];
 
 void main(void)
 {
-	uint8_t keys[12];
+	static uint8_t keys[12];
 
 	SP = (uint8_t)_start__stack;