diff --git a/include/libopencm3/stm32/otg_common.h b/include/libopencm3/stm32/otg_common.h
index f3d13300..7a2e39d5 100644
--- a/include/libopencm3/stm32/otg_common.h
+++ b/include/libopencm3/stm32/otg_common.h
@@ -112,8 +112,6 @@
 #define OTG_GUSBCFG_SRPCAP		0x00000100
 #define OTG_GUSBCFG_HNPCAP		0x00000200
 #define OTG_GUSBCFG_TRDT_MASK		(0xf << 10)
-#define OTG_GUSBCFG_TRDT_16BIT		(0x5 << 10)
-#define OTG_GUSBCFG_TRDT_8BIT		(0x9 << 10)
 #define OTG_GUSBCFG_NPTXRWEN		0x00004000
 #define OTG_GUSBCFG_FHMOD		0x20000000
 #define OTG_GUSBCFG_FDMOD		0x40000000