diff --git a/moo/configure b/moo/configure
index 4ef7a9a..98f36d1 100755
--- a/moo/configure
+++ b/moo/configure
@@ -21634,6 +21634,7 @@ if ${ac_cv_sizeof_sa_family_t+:} false; then :
   $as_echo_n "(cached) " >&6
 else
   if ac_fn_c_compute_int "$LINENO" "(long int) (sizeof (sa_family_t))" "ac_cv_sizeof_sa_family_t"        "
+		#include <sys/types.h>
 		#include <sys/socket.h>
 		#include <netinet/in.h>
 "; then :
@@ -21674,6 +21675,7 @@ else
 /* end confdefs.h.  */
 #include <sys/types.h>
 			 #include <sys/socket.h>
+			 #include <netinet/in.h>
 int
 main ()
 {
diff --git a/moo/configure.ac b/moo/configure.ac
index a07254e..5d46f23 100644
--- a/moo/configure.ac
+++ b/moo/configure.ac
@@ -405,6 +405,7 @@ else
 	fi
 
 	AC_CHECK_SIZEOF(sa_family_t,, [
+		#include <sys/types.h>
 		#include <sys/socket.h>
 		#include <netinet/in.h>])
 	if test ${ac_cv_sizeof_sa_family_t} -gt 0
@@ -413,7 +414,8 @@ else
 			[ AC_DEFINE(MOO_SA_FAMILY_T_IS_SIGNED, 1, [Define if sa_family_t is signed]) ],
 			[ AS_ECHO_N("") ],
 			[#include <sys/types.h>
-			 #include <sys/socket.h>])
+			 #include <sys/socket.h>
+			 #include <netinet/in.h>])
 	fi
 fi