diff --git a/include/tabby.h b/include/tabby.h
index f8eb951..ed702b8 100644
--- a/include/tabby.h
+++ b/include/tabby.h
@@ -13,10 +13,10 @@ typedef enum tabby_clock_mode {
 };
 
 typedef enum tabby_clock_speed {
-    TABBY_CLOCK_SPEED_8192HZ  = 0x01,
-    TABBY_CLOCK_SPEED_16384HZ = 0x02,
-    TABBY_CLOCK_SPEED_32768HZ = 0x04,
-    TABBY_CLOCK_SPEED_65536HZ = 0x08
+    TABBY_CLOCK_SPEED_8192HZ   = 0x01,
+    TABBY_CLOCK_SPEED_16384HZ  = 0x02,
+    TABBY_CLOCK_SPEED_262144HZ = 0x20,
+    TABBY_CLOCK_SPEED_524288HZ = 0x40
 };
 
 typedef struct _tabby_packet {