diff --git a/isobus/src/can_message_data.cpp b/isobus/src/can_message_data.cpp
index fd411ee5..abb10ddc 100644
--- a/isobus/src/can_message_data.cpp
+++ b/isobus/src/can_message_data.cpp
@@ -89,7 +89,7 @@ namespace isobus
 	  parentPointer(parentPointer),
 	  bufferSize(chunkSize)
 	{
-		buffer.reserve(bufferSize);
+		buffer.resize(bufferSize);
 	}
 
 	std::size_t CANMessageDataCallback::size() const