diff --git a/markdownfmt.sh b/markdownfmt.sh
index 6472a6352..c0a99ae0a 100755
--- a/markdownfmt.sh
+++ b/markdownfmt.sh
@@ -1,4 +1,4 @@
 #!/bin/bash
 set -e
 
-exec docker run -it --rm -v "$PWD":/scratch -w /scratch tianon/markdownfmt markdownfmt "$@"
+exec docker run -i --rm -v "$PWD":/scratch -w /scratch tianon/markdownfmt markdownfmt "$@"