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-rw-r--r--src/ipaddrcheck_functions.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/src/ipaddrcheck_functions.h b/src/ipaddrcheck_functions.h
index e444508..4203447 100644
--- a/src/ipaddrcheck_functions.h
+++ b/src/ipaddrcheck_functions.h
@@ -21,6 +21,8 @@
*
*/
+#ifndef IPADDRCHECK_FUNCTIONS_H
+#define IPADDRCHECK_FUNCTIONS_H
#include <stdio.h>
#include <stdlib.h>
@@ -74,3 +76,5 @@ int is_ipv6_link_local(CIDR *address);
int is_valid_intf_address(CIDR *address, char* address_str, int allow_loopback);
int is_any_host(CIDR *address);
int is_any_net(CIDR *address);
+
+#endif /* IPADDRCHECK_FUNCTIONS_H */