diff --git a/src/test.cpp b/src/test.cpp
index 417937e..85b9e9e 100644
--- a/src/test.cpp
+++ b/src/test.cpp
@@ -9,6 +9,7 @@
 #include <limits>
 #include <random>
 #include <stdexcept>
+#include <string>
 #include <vector>
 
 #include "../include/minisketch.h"