1 files changed, 4 insertions, 1 deletions

diff --git a/firmware/export/system.h b/firmware/export/system.h
index 25f9287618..1dab352071 100644
--- a/firmware/export/system.h
+++ b/firmware/export/system.h
@@ -24,7 +24,6 @@
 
 #include <stdbool.h>
 #include <stdint.h>
-
 #include "cpu.h"
 #include "gcc_extensions.h" /* for LIKELY/UNLIKELY */
 
@@ -86,6 +85,10 @@ int get_cpu_boost_counter(void);
 
 #define BAUDRATE 9600
 
+/* wrap-safe macros for tick comparison */
+#define TIME_AFTER(a,b)         ((long)(b) - (long)(a) < 0)
+#define TIME_BEFORE(a,b)        TIME_AFTER(b,a)
+
 #ifndef NULL
 #define NULL ((void*)0)
 #endif