diff --git a/configs/teensy-3.x/src/k20_usbdev.c b/configs/teensy-3.x/src/k20_usbdev.c
index 2cf0d9d2e0..f5f20fbf24 100644
--- a/configs/teensy-3.x/src/k20_usbdev.c
+++ b/configs/teensy-3.x/src/k20_usbdev.c
@@ -59,7 +59,6 @@
 
 #define khci_getreg(addr)      getreg8(addr)
 #define khci_putreg(val,addr)  putreg8(val,addr)
-#define SIM_CLKDIV2_USBDIV(n)  (uint32_t)(((n) & 0x07) << 1)
 
 /************************************************************************************
  * Public Functions