diff --git a/ext/dbm/.cvsignore b/ext/dbm/.cvsignore
index 4088712231..814345ece8 100644
--- a/ext/dbm/.cvsignore
+++ b/ext/dbm/.cvsignore
@@ -1,3 +1,4 @@
 Makefile
 mkmf.log
 *.def
+extconf.h
diff --git a/ext/gdbm/.cvsignore b/ext/gdbm/.cvsignore
index 4088712231..814345ece8 100644
--- a/ext/gdbm/.cvsignore
+++ b/ext/gdbm/.cvsignore
@@ -1,3 +1,4 @@
 Makefile
 mkmf.log
 *.def
+extconf.h