diff --git a/tmk_core/common/report.c b/tmk_core/common/report.c
index 74c6d3fdd47..4b25f4428c1 100644
--- a/tmk_core/common/report.c
+++ b/tmk_core/common/report.c
@@ -176,7 +176,7 @@ void del_key_bit(report_keyboard_t* keyboard_report, uint8_t code)
 }
 #endif
 
-void add_key_to_report(report_keyboard_t* keyboard_report, int8_t key)
+void add_key_to_report(report_keyboard_t* keyboard_report, uint8_t key)
 {
 #ifdef NKRO_ENABLE
     if (keyboard_protocol && keymap_config.nkro) {
@@ -204,4 +204,4 @@ void clear_keys_from_report(report_keyboard_t* keyboard_report)
     for (int8_t i = 1; i < KEYBOARD_REPORT_SIZE; i++) {
         keyboard_report->raw[i] = 0;
     }
-}
\ No newline at end of file
+}
diff --git a/tmk_core/common/report.h b/tmk_core/common/report.h
index 899fc524cbd..a0811f9a3c8 100644
--- a/tmk_core/common/report.h
+++ b/tmk_core/common/report.h
@@ -184,7 +184,7 @@ void add_key_bit(report_keyboard_t* keyboard_report, uint8_t code);
 void del_key_bit(report_keyboard_t* keyboard_report, uint8_t code);
 #endif
 
-void add_key_to_report(report_keyboard_t* keyboard_report, int8_t key);
+void add_key_to_report(report_keyboard_t* keyboard_report, uint8_t key);
 void del_key_from_report(report_keyboard_t* keyboard_report, uint8_t key);
 void clear_keys_from_report(report_keyboard_t* keyboard_report);