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diff --git a/keyboards/crkbd/rev1/legacy/post_config.h b/keyboards/crkbd/rev1/legacy/post_config.h
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+/*
+Copyright 2019 @foostan
+Copyright 2020 Drashna Jaelre <@drashna>
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 2 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#pragma once
+
+#ifdef SSD1306OLED
+# define USE_I2C
+#endif
+
+#if defined(OLED_DRIVER_ENABLE) && (defined(USE_I2C) || defined(USE_MATRIX_I2C))
+# error Cannot use both legacy i2c driver and new i2c_master driver at the same time. Undefine USE_I2C and/or USE_MATRIX_I2C
+#endif