diff --git a/src/mod/applications/mod_spandsp/mod_spandsp_modem.h b/src/mod/applications/mod_spandsp/mod_spandsp_modem.h
index f5e5b214f4..717cb909c4 100644
--- a/src/mod/applications/mod_spandsp/mod_spandsp_modem.h
+++ b/src/mod/applications/mod_spandsp/mod_spandsp_modem.h
@@ -52,6 +52,8 @@
 #elif defined(__FreeBSD__)
 #include <libutil.h>
 #include <termios.h>
+#elif defined(__SunOS)
+#include <termios.h>
 #else
 #include <pty.h>
 #endif