diff --git a/src/str.hpp b/src/str.hpp
index 478e9f8a..1f84f5da 100644
--- a/src/str.hpp
+++ b/src/str.hpp
@@ -91,6 +91,10 @@ namespace str
   startswith(const std::string      &str_,
              const std::string_view  prefix_);
 
+  bool
+  startswith(const std::string &str_,
+             const char        *prefix_);
+
   bool
   startswith(const char *str,
              const char *prefix);