1 files changed, 5 insertions, 0 deletions
diff --git a/DomeKey/errors.h b/DomeKey/errors.h
index d1a97ce..35c3c7d 100644
--- a/DomeKey/errors.h
+++ b/DomeKey/errors.h
@@ -1,5 +1,10 @@
+#ifndef ERRORS_H
+#define ERRORS_H
+
 #define eprintf(...) fprintf( \
     stderr, \
     "dome-key: error: " \
     __VA_ARGS__ \
 )
+
+#endif /* ERRORS_H */