diff --git a/qmk_firmware/keyboards/keyball/keyball39/config.h b/qmk_firmware/keyboards/keyball/keyball39/config.h
index 0d3eb28bd..e16e44760 100644
--- a/qmk_firmware/keyboards/keyball/keyball39/config.h
+++ b/qmk_firmware/keyboards/keyball/keyball39/config.h
@@ -30,6 +30,7 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 // Split parameters
 #define SOFT_SERIAL_PIN         D2
 #define SPLIT_HAND_MATRIX_GRID  F6, B5
+#define SPLIT_HAND_MATRIX_GRID_LOW_IS_LEFT
 #define SPLIT_USB_DETECT
 #define SPLIT_USB_TIMEOUT       500
 
diff --git a/qmk_firmware/keyboards/keyball/keyball44/config.h b/qmk_firmware/keyboards/keyball/keyball44/config.h
index cd28e9341..a8800fc0a 100644
--- a/qmk_firmware/keyboards/keyball/keyball44/config.h
+++ b/qmk_firmware/keyboards/keyball/keyball44/config.h
@@ -30,6 +30,7 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 // Split parameters
 #define SOFT_SERIAL_PIN         D2
 #define SPLIT_HAND_MATRIX_GRID  F7, D4
+#define SPLIT_HAND_MATRIX_GRID_LOW_IS_LEFT
 #define SPLIT_USB_DETECT
 #define SPLIT_USB_TIMEOUT       500
 
diff --git a/qmk_firmware/keyboards/keyball/keyball46/config.h b/qmk_firmware/keyboards/keyball/keyball46/config.h
index fda41a4f4..fca418037 100644
--- a/qmk_firmware/keyboards/keyball/keyball46/config.h
+++ b/qmk_firmware/keyboards/keyball/keyball46/config.h
@@ -31,6 +31,7 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #define SOFT_SERIAL_PIN         D2
 //#define SPLIT_HAND_MATRIX_GRID F7, B5     // for ball
 //#define SPLIT_HAND_MATRIX_GRID F6, B5     // for noball
+//#define SPLIT_HAND_MATRIX_GRID_LOW_IS_LEFT
 #define SPLIT_USB_DETECT
 #define SPLIT_USB_TIMEOUT       500
 
diff --git a/qmk_firmware/keyboards/keyball/keyball61/config.h b/qmk_firmware/keyboards/keyball/keyball61/config.h
index 1b148d5c6..d459c17e7 100644
--- a/qmk_firmware/keyboards/keyball/keyball61/config.h
+++ b/qmk_firmware/keyboards/keyball/keyball61/config.h
@@ -29,6 +29,7 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 // Split parameters
 #define SOFT_SERIAL_PIN         D2
 #define SPLIT_HAND_MATRIX_GRID  F7, D7
+#define SPLIT_HAND_MATRIX_GRID_LOW_IS_LEFT
 #define SPLIT_USB_DETECT
 #define SPLIT_USB_TIMEOUT       500