diff --git a/check_dir.h b/check_dir.h
index 201c1d16..37a14fe5 100644
--- a/check_dir.h
+++ b/check_dir.h
@@ -17,7 +17,12 @@
  *
  */
 
+#ifndef _REPMGR_CHECK_DIR_H_
+#define _REPMGR_CHECK_DIR_H_
+
 int  check_dir(char *dir);
 bool create_directory(char *dir);
 bool set_directory_permissions(char *dir);
 bool is_pg_dir(char *dir);
+
+#endif
diff --git a/config.h b/config.h
index c7749883..5e9cc36e 100644
--- a/config.h
+++ b/config.h
@@ -17,8 +17,8 @@
  *
  */
 
-#ifndef _CONFIG_H_
-#define _CONFIG_H_
+#ifndef _REPMGR_CONFIG_H_
+#define _REPMGR_CONFIG_H_
 
 #include "repmgr.h"
 
diff --git a/dbutils.h b/dbutils.h
index 2d05e953..23ed4afe 100644
--- a/dbutils.h
+++ b/dbutils.h
@@ -17,9 +17,14 @@
  *
  */
 
+#ifndef _REPMGR_DBUTILS_H_
+#define _REPMGR_DBUTILS_H_
+
 PGconn *establishDBConnection(const char *conninfo, const bool exit_on_error);
 bool    is_standby(PGconn *conn);
 char   *pg_version(PGconn *conn, char* major_version);
 bool 	guc_setted(PGconn *conn, const char *parameter, const char *op, const char *value);
 const char   *get_cluster_size(PGconn *conn);
 PGconn * getMasterConnection(PGconn *standby_conn, int id, char *cluster, int *master_id);
+
+#endif