diff --git a/src/libknot/dnssec/key.c b/src/libknot/dnssec/key.c
index 1016c47dfadb34978b133f503ee2427008b969a6..6eee31c29b6307d1566c8ff4df4e8d183f7f3305 100644
--- a/src/libknot/dnssec/key.c
+++ b/src/libknot/dnssec/key.c
@@ -15,10 +15,11 @@
 */
 
 #include <config.h>
-#include <arpa/inet.h>
 #include <assert.h>
 #include <ctype.h>
+#include <sys/types.h>
 #include <netinet/in.h>
+#include <arpa/inet.h>
 #include <stddef.h>
 #include <stdint.h>
 #include <stdio.h>