1 files changed, 2 insertions, 0 deletions
diff --git a/lib/util.c b/lib/util.c
index 8b74dfb..104f2b6 100644
--- a/lib/util.c
+++ b/lib/util.c
@@ -37,6 +37,7 @@ void cpu_init(void)
   CPU_PRESCALE(0);
 }
 
+#if defined JTD
 void jtag_disable(void)
 {
   uint8_t tempreg;
@@ -47,6 +48,7 @@ void jtag_disable(void)
                    : [tempreg] "=d" (tempreg)
                    : [mcucr] "I" (_SFR_IO_ADDR(MCUCR)), [jtd] "M" (_BV(JTD)));
 }
+#endif
 
 #if defined(__BOARD_teensy1__)
   #define BOOTLOADER_VEC 0x3E00