1 files changed, 2 insertions, 0 deletions
diff --git a/rfc2047e.c b/rfc2047e.c
index 28777a30..e6f8f32b 100644
--- a/rfc2047e.c
+++ b/rfc2047e.c
@@ -17,7 +17,9 @@
     Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
 
+#ifndef _GNU_SOURCE
 #define _GNU_SOURCE
+#endif
 #include "fetchmail.h"
 
 #include <string.h>