diff --git a/.gitignore b/.gitignore
index 0eaec0d4ecf..03555c955cf 100644
--- a/.gitignore
+++ b/.gitignore
@@ -14,6 +14,7 @@ Servo.app
 build
 config.mk
 config.stamp
+config.tmp
 parser.out
 src/servo/dom/bindings/codegen/*.rs
 src/servo/dom/bindings/codegen/_cache/