diff --git a/geometry.hpp b/geometry.hpp
index 79bfebec..6a648789 100644
--- a/geometry.hpp
+++ b/geometry.hpp
@@ -4,6 +4,7 @@
 #include <vector>
 #include <atomic>
 #include <set>
+#include <string>
 #include <sqlite3.h>
 #include <stdio.h>