diff --git a/inc/thorvg.h b/inc/thorvg.h
index 2d352543..271ed507 100644
--- a/inc/thorvg.h
+++ b/inc/thorvg.h
@@ -15,6 +15,7 @@
 #define _THORVG_H_
 
 #include <memory>
+#include <string>
 
 #ifdef TVG_BUILD
     #define TVG_EXPORT __attribute__ ((visibility ("default")))