diff --git a/src/sentry_utils.c b/src/sentry_utils.c
index f0e569102..569fa0833 100644
--- a/src/sentry_utils.c
+++ b/src/sentry_utils.c
@@ -296,6 +296,7 @@ sentry__dsn_decref(sentry_dsn_t *dsn)
         sentry_free(dsn->path);
         sentry_free(dsn->public_key);
         sentry_free(dsn->secret_key);
+        sentry_free(dsn->project_id);
         sentry_free(dsn);
     }
 }