diff --git a/common/matrix.h b/common/matrix.h
index 48203c71..d62acb66 100644
--- a/common/matrix.h
+++ b/common/matrix.h
@@ -49,8 +49,6 @@ bool matrix_is_modified(void);
 bool matrix_is_on(uint8_t row, uint8_t col);
 /* matrix state on row */
 matrix_row_t  matrix_get_row(uint8_t row);
-/* count keys pressed */
-uint8_t matrix_key_count(void);
 /* print matrix for debug */
 void matrix_print(void);
 
diff --git a/keyboard/hbkb/matrix.c b/keyboard/hbkb/matrix.c
index f3a0cde5..a24d24b8 100644
--- a/keyboard/hbkb/matrix.c
+++ b/keyboard/hbkb/matrix.c
@@ -182,19 +182,6 @@ void matrix_print(void)
     }
 }
 
-uint8_t matrix_key_count(void)
-{
-    uint8_t count = 0;
-    for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
-#if (MATRIX_COLS <= 8)
-        count += bitpop(matrix[i]);
-#else
-        count += bitpop16(matrix[i]);
-#endif
-    }
-    return count;
-}
-
 #ifdef MATRIX_HAS_GHOST
 inline
 static bool matrix_has_ghost_in_row(uint8_t row)
@@ -205,7 +192,6 @@ static bool matrix_has_ghost_in_row(uint8_t row)
 
     // ghost exists in case same state as other row
     for (uint8_t i=0; i < MATRIX_ROWS; i++) {
-        //if (i != row && (matrix[i] & matrix[row]) == matrix[row])
         if (i != row && (matrix[i] & matrix[row]))
             return true;
     }