diff --git a/include/actsim_agent/log_parser.hpp b/include/actsim_agent/log_parser.hpp
index 3deeca9..cff260f 100644
--- a/include/actsim_agent/log_parser.hpp
+++ b/include/actsim_agent/log_parser.hpp
@@ -27,6 +27,7 @@
 #define __LOG_PARSER__
 
 #include <cluster/artifact.hpp>
+#include <cstddef>
 #include <cstdint>
 #include <vector>
 #include "agent_artifact.hpp"
@@ -64,8 +65,8 @@ class LogParser {
 
     bool failure_mode = false;
 
-    int dut_output_tokens_ = 0;
-    int output_token_difference_ = 0;
+    size_t dut_output_tokens_ = 0;
+    size_t output_token_difference_ = 0;
 };
 
 #endif