diff --git a/src/.cvsignore b/src/.cvsignore
index bccd749a8dbf0270cccfaab4a7c45f575619b62f..8a72500d28eb02fdd56d3da65e82c1985a0e7872 100644
--- a/src/.cvsignore
+++ b/src/.cvsignore
@@ -1,4 +1,5 @@
 Makefile
+builtin.c
 case_info.h
 config.cache
 config.h.in
diff --git a/src/.gitignore b/src/.gitignore
index 7bfdfbcfd8c75b5d9b182be8b987159ffeaa318e..29cb750191b4bdb52ac5fe4639087e22d96c47ca 100644
--- a/src/.gitignore
+++ b/src/.gitignore
@@ -1,4 +1,5 @@
 /Makefile
+/builtin.c
 /case_info.h
 /config.cache
 /config.h.in