diff --git a/tests/TestUtils.h b/tests/TestUtils.h
index 7c847a3..6d973c7 100644
--- a/tests/TestUtils.h
+++ b/tests/TestUtils.h
@@ -3,6 +3,7 @@
 #include "ITS.ITU.PSeries.P2108/P2108.h"
 
 #include <string>  // for std::string
+#include <vector>  // for std::vector
 
 using namespace ITS::ITU::PSeries::P2108;