diff --git a/deepspeed/launcher/runner.py b/deepspeed/launcher/runner.py
index c397cf48fbe2c8b52439a303c3b2e0069c52bfb8..a8191f25cec5cc8e1b85aebcd96759d300474ec3 100755
--- a/deepspeed/launcher/runner.py
+++ b/deepspeed/launcher/runner.py
@@ -227,7 +227,7 @@ def _parse_hostfile(hostfile_lines):
             resource_pool[host] = num_slots
         else:
             logger.error(f"Bad hostfile text: {hostfile_lines}")
-            raise ValueError("Hostfile contains a bad entry: {line}, unable to proceed with launching")
+            raise ValueError(f"Hostfile contains a bad entry: {line}, unable to proceed with launching")
 
     if len(resource_pool) == 0:
         logger.error(f"Bad hostfile text: {hostfile_lines}")