diff --git a/include/dwarfs/integral_value_parser.h b/include/dwarfs/integral_value_parser.h
index 815e56a5..3861e37c 100644
--- a/include/dwarfs/integral_value_parser.h
+++ b/include/dwarfs/integral_value_parser.h
@@ -31,6 +31,7 @@
 #include <fmt/format.h>
 
 #include <folly/Conv.h>
+#include <folly/String.h>
 
 #include "dwarfs/overloaded.h"