diff --git a/src/chipset/opti499.c b/src/chipset/opti499.c
index acac4d87b..f8b878559 100644
--- a/src/chipset/opti499.c
+++ b/src/chipset/opti499.c
@@ -33,7 +33,7 @@
 #include <86box/chipset.h>
 
 typedef struct opti499_t {
-    uint8_t idx,
+    uint8_t idx;
     uint8_t regs[256];
     uint8_t scratch[2];
 } opti499_t;