diff --git a/main/patterns/sparkle.cpp b/main/patterns/sparkle.cpp
index 871ef73..66188e2 100644
--- a/main/patterns/sparkle.cpp
+++ b/main/patterns/sparkle.cpp
@@ -32,7 +32,7 @@ struct Sparkle {
     }
 
     int64_t start_us;
-    int end_us;
+    int64_t end_us;
     int pos;
 };