diff --git a/ext/f2c_libs/.cvsignore b/ext/f2c_libs/.cvsignore
index fff405aff..8f6d076f4 100644
--- a/ext/f2c_libs/.cvsignore
+++ b/ext/f2c_libs/.cvsignore
@@ -1,3 +1,4 @@
+tests
 Makefile
 arith.h
 signal1.h