diff --git a/librepomgr/webapi/params.h b/librepomgr/webapi/params.h
index c21b7b5..b8f6a22 100644
--- a/librepomgr/webapi/params.h
+++ b/librepomgr/webapi/params.h
@@ -26,7 +26,8 @@ struct ServiceSetup;
 namespace WebAPI {
 
 struct LIBREPOMGR_EXPORT BadRequest : std::runtime_error {
-    BadRequest(const char *message);
+    explicit BadRequest(const char *message);
+    explicit BadRequest(const std::string &message);
 };
 
 inline BadRequest::BadRequest(const char *message)
@@ -34,6 +35,11 @@ inline BadRequest::BadRequest(const char *message)
 {
 }
 
+inline BadRequest::BadRequest(const std::string &message)
+    : std::runtime_error(message)
+{
+}
+
 struct LIBREPOMGR_EXPORT Url {
     Url(std::string_view path, std::string_view hash, std::vector<std::pair<std::string_view, std::string_view>> &&params);
     Url(const Request &request);