diff --git a/Config.h b/Config.h
index c7b73cd..0c6b22c 100644
--- a/Config.h
+++ b/Config.h
@@ -22,7 +22,7 @@
 // Allow for the use of high quality external clock oscillators
 // The number is the frequency of the oscillator in Hertz.
 // For 12 MHz
-#define EXTERNAL_OSC 12000000
+// #define EXTERNAL_OSC 12000000
 // For 14.4 MHz
 // #define EXTERNAL_OSC 14400000
 // For 19.2 MHz