diff --git a/config_ini/conf.h b/config_ini/conf.h
index d158605..415a7e0 100644
--- a/config_ini/conf.h
+++ b/config_ini/conf.h
@@ -1,3 +1,6 @@
+#ifndef CONF_H
+#define CONF_H
+
 typedef struct ConfigEntry {
     char               *key;
     char               *value;
@@ -11,3 +14,5 @@ typedef struct {
 Config     *config_load(const char *filename);
 const char *config_get(Config *cfg, const char *key);
 void        config_free(Config *cfg);
+
+#endif // CONF_H