Index: configure.ac
==================================================================
--- configure.ac
+++ configure.ac
@@ -1579,10 +1579,13 @@
 		AC_CHECK_MEMBER(struct sockaddr_at.sat_net, [], [], [
 			#ifdef _WIN32
 			typedef int BOOL;
 			#endif
 
+			#ifdef OF_HAVE_SYS_TYPES_H
+			# include <sys/types.h>
+			#endif
 			#ifdef OF_HAVE_NETATALK_AT_H
 			# include <netatalk/at.h>
 			#endif
 
 			#ifdef _WIN32
@@ -1599,10 +1602,13 @@
 	], [
 		#ifdef _WIN32
 		typedef int BOOL;
 		#endif
 
+		#ifdef OF_HAVE_SYS_TYPES_H
+		# include <sys/types.h>
+		#endif
 		#ifdef OF_HAVE_NETATALK_AT_H
 		# include <netatalk/at.h>
 		#endif
 
 		#ifdef _WIN32