diff --git a/source/common/json/json_internal.cc b/source/common/json/json_internal.cc
index b01ac6e7863b..7065e880fb71 100644
--- a/source/common/json/json_internal.cc
+++ b/source/common/json/json_internal.cc
@@ -525,7 +525,9 @@ std::vector<ObjectSharedPtr> Field::asObjectArray() const {
 
 std::string Field::asJsonString() const {
   nlohmann::json j = asJsonDocument();
-  return j.dump();
+  // Call with defaults except in the case of UTF-8 errors which we replace
+  // invalid UTF-8 characters instead of throwing an exception.
+  return j.dump(-1, ' ', false, nlohmann::detail::error_handler_t::replace);
 }
 
 bool Field::empty() const {