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diff --git a/platforms/chibios/eeprom_teensy.h b/platforms/chibios/eeprom_teensy.h
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+// Copyright 2022 Nick Brassel (@tzarc)
+// SPDX-License-Identifier: GPL-2.0-or-later
+#pragma once
+
+#if defined(K20x)
+/* Teensy 3.0, 3.1, 3.2; mchck; infinity keyboard */
+// The EEPROM is really RAM with a hardware-based backup system to
+// flash memory. Selecting a smaller size EEPROM allows more wear
+// leveling, for higher write endurance. If you edit this file,
+// set this to the smallest size your application can use. Also,
+// due to Freescale's implementation, writing 16 or 32 bit words
+// (aligned to 2 or 4 byte boundaries) has twice the endurance
+// compared to writing 8 bit bytes.
+//
+# ifndef EEPROM_SIZE
+# define EEPROM_SIZE 32
+# endif
+#elif defined(KL2x) /* Teensy LC (emulated) */
+# define EEPROM_SIZE 128
+#else
+# error Unsupported Teensy EEPROM.
+#endif