diff --git a/Makefile b/Makefile
index 1348ce35..c013ba46 100755
--- a/Makefile
+++ b/Makefile
@@ -251,7 +251,7 @@ endif
 wav: fsk-wav
 
 fsk-wav: $(BIN)
-	export PYTHONPATH='.' && python stm_audio_bootloader/fsk/encoder.py \
+	export PYTHONPATH='.' && python2 stm_audio_bootloader/fsk/encoder.py \
 		-s 44100 -b 16 -n 8 -z 4 -p 256 -g 16384 -k 1800 \
 		$(BIN)