diff --git a/sim/fakes/time.py b/sim/fakes/time.py
index 62c6c33efa7a0579ae7bfaa6a9b11baf2d1cb477..a710a2fcf62c00a8fc26617bf25c700578c98847 100644
--- a/sim/fakes/time.py
+++ b/sim/fakes/time.py
@@ -8,4 +8,7 @@ def ticks_ms():
     return int(_time.time() * 1000)
 
 def ticks_diff(a, b):
-    return a - b
\ No newline at end of file
+    return a - b
+
+def ticks_add(a, b):
+    return a + b