diff --git a/builtin/.gitignore b/builtin/.gitignore
new file mode 100644
index 000000000..3de1c7b32
--- /dev/null
+++ b/builtin/.gitignore
@@ -0,0 +1,3 @@
+builtin_list.h
+builtin_proto.h
+
diff --git a/builtin/registry/.gitignore b/builtin/registry/.gitignore
new file mode 100644
index 000000000..2b3185375
--- /dev/null
+++ b/builtin/registry/.gitignore
@@ -0,0 +1,3 @@
+*.bdat
+*.pdat
+