diff --git a/common/print.h b/common/print.h
index a8dbbc02..c0e9e143 100644
--- a/common/print.h
+++ b/common/print.h
@@ -38,12 +38,7 @@
 #if defined(__AVR__)
 
 #include "avr/xprintf.h"
-
-
-// TODO: avoid collision with arduino/Print.h
-#ifndef __cplusplus
 #define print(s)    xputs(PSTR(s))
-#endif
 #define println(s)  xputs(PSTR(s "\r\n"))
 
 #ifdef __cplusplus
diff --git a/converter/usb_usb/matrix.c b/converter/usb_usb/matrix.c
index 3cdb0860..83d5ab6c 100644
--- a/converter/usb_usb/matrix.c
+++ b/converter/usb_usb/matrix.c
@@ -81,7 +81,7 @@ bool matrix_is_on(uint8_t row, uint8_t col) {
             return true;
         }
     }
-    for (uint8_t i = 0; i < REPORT_KEYS; i++) {
+    for (uint8_t i = 0; i < KEYBOARD_REPORT_KEYS; i++) {
         if (usb_hid_keyboard_report.keys[i] == code) {
             return true;
         }
@@ -96,7 +96,7 @@ uint8_t matrix_get_row(uint8_t row) {
         row_bits |= usb_hid_keyboard_report.mods;
     }
 
-    for (uint8_t i = 0; i < REPORT_KEYS; i++) {
+    for (uint8_t i = 0; i < KEYBOARD_REPORT_KEYS; i++) {
         if (IS_ANY(usb_hid_keyboard_report.keys[i])) {
             if (row == ROW(usb_hid_keyboard_report.keys[i])) {
                 row_bits |= ROW_BITS(usb_hid_keyboard_report.keys[i]);
@@ -110,7 +110,7 @@ uint8_t matrix_key_count(void) {
     uint8_t count = 0;
 
     count += bitpop(usb_hid_keyboard_report.mods);
-    for (uint8_t i = 0; i < REPORT_KEYS; i++) {
+    for (uint8_t i = 0; i < KEYBOARD_REPORT_KEYS; i++) {
         if (IS_ANY(usb_hid_keyboard_report.keys[i])) {
             count++;
         }
diff --git a/protocol/usb_hid.mk b/protocol/usb_hid.mk
index fb4916d5..6914dce8 100644
--- a/protocol/usb_hid.mk
+++ b/protocol/usb_hid.mk
@@ -42,7 +42,7 @@ SRC += $(USB_HID_DIR)/override_Serial.cpp
 
 # replace arduino/wiring.c
 SRC += $(USB_HID_DIR)/override_wiring.c
-SRC += common/timer.c
+SRC += common/avr/timer.c
 
 SRC += $(USB_HOST_SHIELD_SRC)
 SRC += $(ARDUINO_CORES_SRC)