1 files changed, 6 insertions, 4 deletions

diff --git a/keyboards/lets_split/rules.mk b/keyboards/lets_split/rules.mk
index 0dc549130..0efa78550 100644
--- a/keyboards/lets_split/rules.mk
+++ b/keyboards/lets_split/rules.mk
@@ -76,10 +76,12 @@ CUSTOM_MATRIX = yes
 
 avrdude: build
         ls /dev/tty* > /tmp/1; \
-        echo "Reset your Pro Micro then hit any key to continue..."; \
-        read -n 1 -s; \
-        ls /dev/tty* > /tmp/2; \
-        USB=`diff /tmp/1 /tmp/2 | grep '>' | sed -e 's/> //'`; \
+        echo "Reset your Pro Micro now"; \
+        while [[ -z $$USB ]]; do \
+          sleep 1; \
+          ls /dev/tty* > /tmp/2; \
+          USB=`diff /tmp/1 /tmp/2 | grep -o '/dev/tty.*'`; \
+        done; \
         avrdude -p $(MCU) -c avr109 -P $$USB -U flash:w:$(BUILD_DIR)/$(TARGET).hex
 
 .PHONY: avrdude