diff --git a/configure.in b/configure.in
index 037005d..4ce6282 100644
--- a/configure.in
+++ b/configure.in
@@ -9,6 +9,7 @@ if test "$GCC" = yes; then
     CFLAGS="$CFLAGS -pipe -W -Wall -Wshadow -Wstrict-prototypes"
 fi
 
+AC_CHECK_HEADERS([sys/filio.h])
 AC_CHECK_FUNCS(vasprintf)
 
 AC_CHECK_LIB(socket, socket, [SOCK_LIBS="-lsocket"])
diff --git a/src/drv_imap.c b/src/drv_imap.c
index fcdc1f1..5398449 100644
--- a/src/drv_imap.c
+++ b/src/drv_imap.c
@@ -36,6 +36,9 @@
 #include <ctype.h>
 #include <sys/socket.h>
 #include <sys/ioctl.h>
+#ifdef HAVE_SYS_FILIO_H
+# include <sys/filio.h>
+#endif
 #include <netinet/in.h>
 #include <netinet/tcp.h>
 #include <arpa/inet.h>