diff --git a/testhal/AVR/EXT/mcuconf.h b/testhal/AVR/EXT/mcuconf.h
index 0944ab219..e1ad00fd8 100644
--- a/testhal/AVR/EXT/mcuconf.h
+++ b/testhal/AVR/EXT/mcuconf.h
@@ -83,7 +83,7 @@
 /*
  * I2C driver system settings.
  */
-#define AVR_I2C_USE_I2C1                   TRUE
+#define AVR_I2C_USE_I2C1                   FALSE
 
 /*
  * SPI driver system settings.