diff --git a/src/RingBuffer.hpp b/src/RingBuffer.hpp
index 9e02f59..2ba5a75 100644
--- a/src/RingBuffer.hpp
+++ b/src/RingBuffer.hpp
@@ -20,11 +20,11 @@ struct FrameMetadata
     }
 
     // Ring buffer needed data.
-    size_t buffer_slot_index = -1;
+    size_t buffer_slot_index = 0;
     size_t frame_bytes_size = 0;
     
     // Image header data.
-    uint64_t frame_index = -1;
+    uint64_t frame_index = 0;
     std::string endianness = "";
     std::string type;
     size_t frame_shape[2];