diff --git a/keyboards/basekeys/slice/rev1/config.h b/keyboards/basekeys/slice/rev1/config.h
index a02154d82b..d151d5873f 100644
--- a/keyboards/basekeys/slice/rev1/config.h
+++ b/keyboards/basekeys/slice/rev1/config.h
@@ -28,7 +28,7 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 /* key matrix size */
 #define MATRIX_ROWS 10
-#define MATRIX_COLS 18
+#define MATRIX_COLS 9
 
 // wiring of each half
 #define MATRIX_ROW_PINS { D4, C6, D7, E6, B4 }
diff --git a/keyboards/basekeys/slice/rev1_rgb/config.h b/keyboards/basekeys/slice/rev1_rgb/config.h
index 6d423d9b5e..1145d08647 100644
--- a/keyboards/basekeys/slice/rev1_rgb/config.h
+++ b/keyboards/basekeys/slice/rev1_rgb/config.h
@@ -28,7 +28,7 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 /* key matrix size */
 #define MATRIX_ROWS 10
-#define MATRIX_COLS 18
+#define MATRIX_COLS 9
 
 // wiring of each half
 #define MATRIX_ROW_PINS { D4, C6, D7, E6, B4 }