diff --git a/contrib/ci/docker/rebuild-docker-images.py b/contrib/ci/docker/rebuild-docker-images.py
index 916fa2ee2..11f40eb39 100755
--- a/contrib/ci/docker/rebuild-docker-images.py
+++ b/contrib/ci/docker/rebuild-docker-images.py
@@ -82,7 +82,7 @@ def run_or_report(*args, myline):
             log.write(e.output.encode())
             global failure
             failure = True
-            print_line(myline, "\033[31;1mError! See {} for details", log.name)
+            print_line(myline, "\033[31;1mError! See {} for details".format(log.name))
             raise e