diff --git a/.gitignore b/.gitignore
index 079fcae258..b137867f5f 100644
--- a/.gitignore
+++ b/.gitignore
@@ -18,3 +18,4 @@ GTAGS
 fuzz/libFuzzer/*
 fuzz/corpus
 fuzz/out
+.chk
diff --git a/.hgignore b/.hgignore
index a8d626ecdd..feef650075 100644
--- a/.hgignore
+++ b/.hgignore
@@ -18,3 +18,4 @@ GTAGS
 fuzz/libFuzzer/*
 fuzz/corpus
 fuzz/out
+.chk
diff --git a/mach b/mach
index 16e6dcab02..22546d732b 100755
--- a/mach
+++ b/mach
@@ -66,7 +66,7 @@ class cfAction(argparse.Action):
             for file in files:
                 with open(os.path.join(dirname, file), "rb") as f:
                     hash.update(f.read())
-        chk_file = cwd + "/out/.chk"
+        chk_file = cwd + "/.chk"
         old_chk = ""
         new_chk = hash.hexdigest()
         if os.path.exists(chk_file):