diff --git a/tests/.gitignore b/tests/.gitignore
index 380bff73b..f638a8af8 100644
--- a/tests/.gitignore
+++ b/tests/.gitignore
@@ -12,6 +12,7 @@ collate.out
 completion-test
 convert-test
 cxx-test
+datetime
 deftype
 dirname-test
 env-test