diff --git a/m4/.cvsignore b/m4/.cvsignore
index 18d652de..22041676 100644
--- a/m4/.cvsignore
+++ b/m4/.cvsignore
@@ -27,6 +27,7 @@ quote.m4
 quotearg.m4
 stdbool.m4
 stpcpy.m4
+strdup.m4
 strerror_r.m4
 strndup.m4
 strnlen.m4