diff --git a/delta_performer.h b/delta_performer.h
index 8fffffb..15c8af3 100644
--- a/delta_performer.h
+++ b/delta_performer.h
@@ -7,6 +7,7 @@
 
 #include <inttypes.h>
 
+#include <string>
 #include <vector>
 
 #include <base/time/time.h>