diff --git a/main.r b/main.r
index 7f91470..ec25f78 100644
--- a/main.r
+++ b/main.r
@@ -11,7 +11,7 @@ r <- plumber::pr_set_api_spec(r, function(spec) {
   ejam_ref <- Sys.getenv("EJAM_VERSION")
   if (nzchar(ejam_ref)) {
     description <- spec$info$description
-    if (is.null(description) || !length(description) || is.na(description)) {
+    if (is.null(description) || length(description) != 1L || is.na(description)) {
       description <- ""
     }
     separator <- if (nzchar(description)) "\n\n" else ""