diff --git a/test_helpers/Utils.cpp b/test_helpers/Utils.cpp
index 4c0e816..4d87d53 100644
--- a/test_helpers/Utils.cpp
+++ b/test_helpers/Utils.cpp
@@ -26,7 +26,7 @@
 #include <cctype>
 #include <iomanip>
 #include <string>
-
+#include <cerrno>
 namespace
 {
 /* Advance the iterator to the first character which is not a comment
@@ -161,4 +161,4 @@
     fs.ignore(1);
 
     return std::make_tuple(width, height, max_val);
-}
\ No newline at end of file
+}