diff --git a/srcpkgs/cvs/patches/vasnprintf.diff b/srcpkgs/cvs/patches/vasnprintf.diff
new file mode 100644
index 00000000000..f6647177a88
--- /dev/null
+++ b/srcpkgs/cvs/patches/vasnprintf.diff
@@ -0,0 +1,16 @@
+--- lib/vasnprintf.c.orig	2015-05-16 16:57:13.712246576 +0200
++++ lib/vasnprintf.c	2015-05-16 16:57:38.471145720 +0200
+@@ -557,13 +557,7 @@
+ 		    break;
+ 		  }
+ 		*p = dp->conversion;
+-#if USE_SNPRINTF
+-		p[1] = '%';
+-		p[2] = 'n';
+-		p[3] = '\0';
+-#else
+ 		p[1] = '\0';
+-#endif
+ 
+ 		/* Construct the arguments for calling snprintf or sprintf.  */
+ 		prefix_count = 0;
diff --git a/srcpkgs/cvs/template b/srcpkgs/cvs/template
index 60f999cd2c0..2e0cfb41dac 100644
--- a/srcpkgs/cvs/template
+++ b/srcpkgs/cvs/template
@@ -1,7 +1,7 @@
 # Template file for 'cvs'
 pkgname=cvs
 version=1.12.13
-revision=3
+revision=4
 build_style=gnu-configure
 configure_args="--with-editor=/usr/bin/vi --with-external-zlib
  ac_cv_func_working_mktime=yes"  # broken test upstream