diff --git a/firmware/lib/logging/Logger.h b/firmware/lib/logging/Logger.h
index 68285b0..e0f041a 100644
--- a/firmware/lib/logging/Logger.h
+++ b/firmware/lib/logging/Logger.h
@@ -33,7 +33,7 @@ public:
       return false;
 
     memcpy(&data_[currentSize_], &time, sizeof(time));
-    currentSize_ += time;
+    currentSize_ += sizeof(time);
 
     const auto spaceLeft = totalSize_ - currentSize_;
     auto charsWritten = snprintf(&data_[currentSize_], spaceLeft, formatStr,