1 files changed, 5 insertions, 0 deletions
diff --git a/strings.h b/strings.h
index 7721f63..2ceade8 100644
--- a/strings.h
+++ b/strings.h
@@ -1,3 +1,6 @@
+#ifndef STRINGS_H
+#define STRINGS_H
+
 #include <stdint.h>
 
 void uint32_to_bits(uint32_t number, char *buf)
@@ -7,3 +10,5 @@ void uint32_to_bits(uint32_t number, char *buf)
 
   buf[32] = '\0';
 }
+
+#endif // STRINGS_H