diff --git a/src/libpisp/common/pisp_utils.cpp b/src/libpisp/common/pisp_utils.cpp
index ebf3a2a..99b637d 100644
--- a/src/libpisp/common/pisp_utils.cpp
+++ b/src/libpisp/common/pisp_utils.cpp
@@ -8,6 +8,7 @@
 #include <cmath>
 #include <cstdint>
 #include <map>
+#include <string>
 
 #include "backend/pisp_be_config.h"