diff --git a/lib/src/account_mastodon.cpp b/lib/src/account_mastodon.cpp
index 8a1e157..306479c 100644
--- a/lib/src/account_mastodon.cpp
+++ b/lib/src/account_mastodon.cpp
@@ -78,7 +78,7 @@ string MastodonAPI::get_stream_id(const stream_type type,
     {
         if (!id)
         {
-            throw runtime_error("No hashtag given.");
+            throw runtime_error{"No hashtag given."};
         }
         return string("hashtag_") += id.value();
         break;
@@ -87,7 +87,7 @@ string MastodonAPI::get_stream_id(const stream_type type,
     {
         if (!id)
         {
-            throw runtime_error("No list ID given.");
+            throw runtime_error{"No list ID given."};
         }
         return string("list_") += id.value();
         break;