1 files changed, 10 insertions, 0 deletions

diff --git a/tmk_core/common/matrix.h b/tmk_core/common/matrix.h
index 2543f5abc..e5665bf40 100644
--- a/tmk_core/common/matrix.h
+++ b/tmk_core/common/matrix.h
@@ -31,6 +31,16 @@ typedef  uint32_t   matrix_row_t;
 #error "MATRIX_COLS: invalid value"
 #endif
 
+#if (MATRIX_ROWS <= 8)
+typedef  uint8_t    matrix_col_t;
+#elif (MATRIX_ROWS <= 16)
+typedef  uint16_t   matrix_col_t;
+#elif (MATRIX_ROWS <= 32)
+typedef  uint32_t   matrix_col_t;
+#else
+#error "MATRIX_ROWS: invalid value"
+#endif
+
 #define MATRIX_IS_ON(row, col)  (matrix_get_row(row) && (1<<col))