diff --git a/lasso/saml-2.0/provider.c b/lasso/saml-2.0/provider.c
index e6afe821..3aee6a09 100644
--- a/lasso/saml-2.0/provider.c
+++ b/lasso/saml-2.0/provider.c
@@ -21,8 +21,6 @@
  * along with this program; if not, see <http://www.gnu.org/licenses/>.
  */
 
-#define _POSIX_SOURCE
-
 #include <errno.h>
 #include <string.h>