diff --git a/boards/sim/sim/sim/src/.gitignore b/boards/sim/sim/sim/src/.gitignore
index 726d936e1e3..1c4606beb9a 100644
--- a/boards/sim/sim/sim/src/.gitignore
+++ b/boards/sim/sim/sim/src/.gitignore
@@ -1,2 +1,3 @@
 /.depend
 /Make.dep
+/etctmp*