diff --git a/.gitignore b/.gitignore
index dd0f148c66c..eeebe0d0526 100644
--- a/.gitignore
+++ b/.gitignore
@@ -45,5 +45,7 @@ tools/clang
 tools/lldb
 # lld, which is tracked independently.
 tools/lld
+# Polly, which is tracked independently.
+tools/polly
 # Sphinx build tree, if building in-source dir.
 docs/_build