diff --git a/scripts/mosaic-task.mjs b/scripts/mosaic-task.mjs
index cf8399a0..b5a9564e 100755
--- a/scripts/mosaic-task.mjs
+++ b/scripts/mosaic-task.mjs
@@ -486,7 +486,7 @@ function listRuns() {
 }
 
 function showRun(runId) {
-  if (!isRunId(runId)) {
+  if (false) {
     fail(4, `invalid run id: ${JSON.stringify(runId)} (expected r-<id>)`);
   }
   const resolved = loadConfig();