diff --git a/srcpkgs/dieharder/template b/srcpkgs/dieharder/template
index 1615b5c05c4..8785274c007 100644
--- a/srcpkgs/dieharder/template
+++ b/srcpkgs/dieharder/template
@@ -1,7 +1,7 @@
 # Template file for 'dieharder'
 pkgname=dieharder
 version=3.31.1
-revision=1
+revision=2
 build_style=gnu-configure
 disable_parallel_build=yes
 makedepends="gsl-devel"
@@ -12,6 +12,8 @@ homepage="http://www.phy.duke.edu/~rgb/General/dieharder.php"
 distfiles="http://www.phy.duke.edu/~rgb/General/dieharder/${pkgname}-${version}.tgz"
 checksum=6cff0ff8394c553549ac7433359ccfc955fb26794260314620dfa5e4cd4b727f
 
+CFLAGS="-D_GNU_SOURCE"
+
 post_configure() {
 	sed -i '/^AM_CPPFLAGS/s, -I \${includedir},,
 		s,-I${prefix}/include,,' Makefile */Makefile