diff --git a/.gitignore b/.gitignore
index 7ed2266af56b..0e8a98c45f22 100644
--- a/.gitignore
+++ b/.gitignore
@@ -23,6 +23,7 @@ ID
 /.mozconfig*
 /mozconfig
 /configure
+/old-configure
 /config.cache
 /config.log
 /.clang_complete
@@ -40,6 +41,7 @@ _OPT.OBJ/
 
 # SpiderMonkey configury
 js/src/configure
+js/src/old-configure
 js/src/autom4te.cache
 # SpiderMonkey test result logs
 js/src/tests/results-*.html
diff --git a/.hgignore b/.hgignore
index 31f1b149453d..e81bf3b693e5 100644
--- a/.hgignore
+++ b/.hgignore
@@ -19,6 +19,7 @@
 ^\.mozconfig
 ^mozconfig*
 ^configure$
+^old-configure$
 ^config\.cache$
 ^config\.log$
 ^\.clang_complete
@@ -37,6 +38,7 @@ _OPT\.OBJ/
 
 # SpiderMonkey configury
 ^js/src/configure$
+^js/src/old-configure$
 ^js/src/autom4te.cache$
 # SpiderMonkey test result logs
 ^js/src/tests/results-.*\.(html|txt)$