--- a/rigs/prm80/prm80.h
+++ b/rigs/prm80/prm80.h
@@ -23,6 +23,7 @@
 #define _PRM80_H 1

 #include <hamlib/rig.h>
+#include <sys/time.h> /* for timeval */

 #define BACKEND_VER "20210416"