diff --git a/src/hydra-queue-runner/token-server.hh b/src/hydra-queue-runner/token-server.hh
index cdd03b5e..6c0cf716 100644
--- a/src/hydra-queue-runner/token-server.hh
+++ b/src/hydra-queue-runner/token-server.hh
@@ -39,7 +39,7 @@ public:
             : ts(ts), tokens(tokens)
         {
             if (tokens >= ts->maxTokens)
-                throw NoTokens(format("requesting more tokens (%d) than exist (%d)") % tokens);
+                throw NoTokens(format("requesting more tokens (%d) than exist (%d)") % tokens % ts->maxTokens);
             auto inUse(ts->inUse.lock());
             while (*inUse + tokens > ts->maxTokens)
                 if (timeout) {