diff --git a/src/V3Hash.cpp b/src/V3Hash.cpp
index 2f1b33003..35d924771 100644
--- a/src/V3Hash.cpp
+++ b/src/V3Hash.cpp
@@ -18,6 +18,7 @@
 
 #include <functional>
 #include <iomanip>
+#include <iostream>
 
 V3Hash::V3Hash(const std::string& val)
     : m_value{static_cast<uint32_t>(std::hash<std::string>{}(val))} {}