diff --git a/src/defaults.h b/src/defaults.h
index c39149a..480f229 100644
--- a/src/defaults.h
+++ b/src/defaults.h
@@ -38,8 +38,8 @@
  * the software.
  */
 
-#ifndef DEFAULTS_H
-# define DEFAULTS_H 1
+#ifndef DHCPD_POOLS_DEFAULTS_H
+# define DHCPD_POOLS_DEFAULTS_H 1
 
 # include "dhcpd-pools.h"
 
@@ -52,4 +52,4 @@ static const size_t MAXLEN = 1024;
  * \brief Maximum number of different shared networks in dhcpd.conf file. */
 static const unsigned int SHARED_NETWORKS = 8192;
 
-#endif				/* DEFAULTS_H */
+#endif				/* DHCPD_POOLS_DEFAULTS_H */