diff --git a/src/common/str_utils.hpp b/src/common/str_utils.hpp
index 7b1f0288cc..a822d17525 100644
--- a/src/common/str_utils.hpp
+++ b/src/common/str_utils.hpp
@@ -6,6 +6,7 @@
 #include <cstdint>
 #include <algorithm>
 #include <assert.h>
+#include "../lang/string_view_utf8.hpp"
 
 inline constexpr char CHAR_SPACE = ' ';
 inline constexpr char CHAR_NBSP = '\xA0'; /// Non Breaking Space
@@ -384,6 +385,8 @@ class StringBuilder {
 
     void append_string(const char *str);
 
+    void append_string_view(string_view_utf8 str);
+
     /// Appends text to the builder, using vsnprintf under the hood.
     void __attribute__((format(__printf__, 2, 3)))
     append_printf(const char *fmt, ...);