diff --git a/clic/include/utils.hpp b/clic/include/utils.hpp
index de351f271..ee5de2033 100644
--- a/clic/include/utils.hpp
+++ b/clic/include/utils.hpp
@@ -4,7 +4,9 @@
 #include <cstdint>
 #include <fstream>
 #include <iostream>
+#include <istream>
 #include <limits>
+#include <string>
 
 #include <cmath>
 #ifndef M_PI