diff --git a/util/.gitignore b/util/.gitignore
index 16aa98136..6852dfc87 100644
--- a/util/.gitignore
+++ b/util/.gitignore
@@ -23,6 +23,7 @@ tile2img.ttp
 xpm2ppm.ttp
 nethack.tags
 readtags
+lua-*.dll
 # dev tool for analyzing data collected by nethack's #define MONITOR_HEAP
 heaputil
 heaputil.c