diff --git a/app/src/DriverUtils.cpp b/app/src/DriverUtils.cpp
index b4c5e56..7071037 100644
--- a/app/src/DriverUtils.cpp
+++ b/app/src/DriverUtils.cpp
@@ -15,6 +15,7 @@
 
 #include <algorithm>  // for std::transform
 #include <cctype>     // for std::tolower
+#include <cstddef>    // for std::size_t
 #include <ctime>      // for localtime_{s,r}, std::{time, time_t, tm, strftime}
 #include <iomanip>    // for std::setfill, std::setw
 #include <iostream>   // for std::cerr, std::endl
@@ -97,7 +98,7 @@ DrvrReturnCode ParseDouble(const std::string &str, double &value) {
  ******************************************************************************/
 DrvrReturnCode ParseInteger(const std::string &str, int &value) {
     try {
-        size_t pos;
+        std::size_t pos;
         value = std::stoi(str, &pos, 10);
 
         // Verify the entire string was parsed