diff --git a/centipede/sancov_state.cc b/centipede/sancov_state.cc
index 1bda5882..c5bbaf34 100644
--- a/centipede/sancov_state.cc
+++ b/centipede/sancov_state.cc
@@ -21,6 +21,7 @@
 #include <cstdlib>
 #include <cstring>
 #include <functional>
+#include <string>
 #include <vector>
 
 #include "absl/base/nullability.h"