diff --git a/configure.ac b/configure.ac
index 0b63294..c6a9a0e 100644
--- a/configure.ac
+++ b/configure.ac
@@ -28,7 +28,7 @@ esac
 AC_SUBST(WINSOCK2_LIBS)
 AC_SUBST(DLL_LDFLAGS)
 
-AC_CHECK_HEADERS(windows.h winsock2.h io.h process.h unistd.h inttypes.h stdint.h getopt.h libc.h malloc.h dlfcn.h regex.h sys/socket.h sys/uio.h aio.h sys/mman.h sys/wait.h sys/resource.h sys/time.h endian.h)
+AC_CHECK_HEADERS(windows.h winsock2.h io.h process.h unistd.h inttypes.h stdint.h getopt.h libc.h malloc.h dlfcn.h regex.h sys/socket.h netinet/in.h sys/uio.h aio.h sys/mman.h sys/wait.h sys/resource.h sys/time.h endian.h)
 
 AC_CHECK_FUNCS(setenv waitpid setrlimit gettimeofday fork kill pipe _pipe)
 AC_CHECK_FUNCS(open64 lseek64 mmap64 fopen64 fseeko _IO_getc getline getdelim __getdelim fgetln __srefill map_fd memalign posix_memalign aio_read accept bind socket readv pread recv recvfrom recvmsg mmap valloc sigaction getpagesize)