defeat some warnings

1 files changed, 3 insertions, 1 deletions

diff --git a/include/json.h b/include/json.h
index 6f9fec9..307ac83 100644
--- a/include/json.h
+++ b/include/json.h
@@ -286,7 +286,9 @@ namespace crow
                     case type::String:
                         return boost::lexical_cast<int64_t>(start_, end_-start_);
                     default:
-                        throw std::runtime_error(strcat("expected number, got: ", get_type_str(t())));
+                        const std::string msg = "expected number, got: "
+                            + std::string(get_type_str(t()));
+                        throw std::runtime_error(msg);
                 }
 #endif
                 return boost::lexical_cast<int64_t>(start_, end_-start_);