diff --git a/lambda-test/Makefile b/lambda-test/Makefile
index d5fcefd..a533629 100644
--- a/lambda-test/Makefile
+++ b/lambda-test/Makefile
@@ -28,7 +28,7 @@
 
 PROGRAMMER_TYPE = avrisp
 # extra arguments to avrdude: baud rate, chip type, -F flag, etc.
-PROGRAMMER_ARGS = -b 19200 -P /dev/ttyACM3
+PROGRAMMER_ARGS = -b 19200 -P /dev/ttyACM0
 
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 ##########                   Makefile Magic!                    ##########