1 files changed, 5 insertions, 1 deletions

diff --git a/tmk_core/protocol/vusb/main.c b/tmk_core/protocol/vusb/main.c
index 8e4a266e9..f6a0c7e9a 100644
--- a/tmk_core/protocol/vusb/main.c
+++ b/tmk_core/protocol/vusb/main.c
@@ -48,8 +48,12 @@ int main(void)
     uint16_t last_timer = timer_read();
 #endif
 
+#ifdef CLKPR
+    // avoid unintentional changes of clock frequency in devices that have a
+    // clock prescaler
     CLKPR = 0x80, CLKPR = 0;
-#ifndef PS2_USE_USART
+#endif
+#ifndef NO_UART
     uart_init(UART_BAUD_RATE);
 #endif