diff --git a/sw/o65.h b/sw/o65.h
index 6191a25..1871ec9 100644
--- a/sw/o65.h
+++ b/sw/o65.h
@@ -58,7 +58,7 @@ typedef struct {
     uint8_t olen;
     uint8_t type;
     uint8_t data[1];    //This is actually variable length
-} o65_opt;
+} o65_opt_t;
 
 #endif