1 files changed, 1 insertions, 0 deletions

diff --git a/src/die.h b/src/die.h
index d993cdab..c0bd0247 100644
--- a/src/die.h
+++ b/src/die.h
@@ -17,6 +17,7 @@
    02110-1301, USA.  */
 
 #ifndef DIE_H
+#define DIE_H
 
 #include <error.h>
 #include <stdbool.h>