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-rw-r--r--keyboards/lets_split/matrix.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/keyboards/lets_split/matrix.c b/keyboards/lets_split/matrix.c
index 16c2ba0ba..1d768c59b 100644
--- a/keyboards/lets_split/matrix.c
+++ b/keyboards/lets_split/matrix.c
@@ -29,6 +29,7 @@ along with this program. If not, see <http://www.gnu.org/licenses/>.
#include "util.h"
#include "matrix.h"
#include "i2c.h"
+#include "serial.h"
#include "split_util.h"
#include "pro_micro.h"
#include "config.h"