diff --git a/tools/releasetools/ota_from_target_files.py b/tools/releasetools/ota_from_target_files.py
index 457826bfa..4d5b8b885 100755
--- a/tools/releasetools/ota_from_target_files.py
+++ b/tools/releasetools/ota_from_target_files.py
@@ -996,8 +996,8 @@ else if get_stage("%(bcb_dev)s") != "3/3" then
     script.Comment("Stage 1/3")
 
   # Dump fingerprints
-  script.Print(source_fp)
-  script.Print(target_fp)
+  script.Print("Source: %s" % (source_fp,))
+  script.Print("Target: %s" % (target_fp,))
 
   script.Print("Verifying current system...")