3 files changed, 6 insertions, 4 deletions

diff --git a/docs/feature_oled_driver.md b/docs/feature_oled_driver.md
index 29548cb82..ebabc314f 100644
--- a/docs/feature_oled_driver.md
+++ b/docs/feature_oled_driver.md
@@ -104,7 +104,7 @@ void oled_task_user(void) {
 |`OLED_DISPLAY_ADDRESS`     |`0x3C`           |The i2c address of the OLED Display                                                                                       |
 |`OLED_FONT_H`              |`"glcdfont.c"`   |The font code file to use for custom fonts                                                                                |
 |`OLED_FONT_START`          |`0`              |The starting characer index for custom fonts                                                                              |
-|`OLED_FONT_END`            |`224`            |The ending characer index for custom fonts                                                                                |
+|`OLED_FONT_END`            |`223`            |The ending characer index for custom fonts                                                                                |
 |`OLED_FONT_WIDTH`          |`6`              |The font width                                                                                                            |
 |`OLED_FONT_HEIGHT`         |`8`              |The font height (untested)                                                                                                |
 |`OLED_TIMEOUT`             |`60000`          |Turns off the OLED screen after 60000ms of keyboard inactivity. Helps reduce OLED Burn-in. Set to 0 to disable.           |
diff --git a/drivers/oled/oled_driver.c b/drivers/oled/oled_driver.c
index f20f4629a..e541228ea 100644
--- a/drivers/oled/oled_driver.c
+++ b/drivers/oled/oled_driver.c
@@ -392,6 +392,8 @@ void oled_write_char(const char data, bool invert) {
     static uint8_t oled_temp_buffer[OLED_FONT_WIDTH];
     memcpy(&oled_temp_buffer, oled_cursor, OLED_FONT_WIDTH);
 
+    _Static_assert(sizeof(font) >= ((OLED_FONT_END + 1 - OLED_FONT_START) * OLED_FONT_WIDTH), "OLED_FONT_END references outside array");
+
     // set the reder buffer data
     uint8_t cast_data = (uint8_t)data;  // font based on unsigned type for index
     if (cast_data < OLED_FONT_START || cast_data > OLED_FONT_END) {
@@ -585,4 +587,4 @@ void oled_task(void) {
 #endif
 }
 
-__attribute__((weak)) void oled_task_user(void) {}
\ No newline at end of file
+__attribute__((weak)) void oled_task_user(void) {}
diff --git a/drivers/oled/oled_driver.h b/drivers/oled/oled_driver.h
index f490f367a..e8a718857 100644
--- a/drivers/oled/oled_driver.h
+++ b/drivers/oled/oled_driver.h
@@ -131,7 +131,7 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #endif
 // unsigned char value of the last character in the font file
 #if !defined(OLED_FONT_END)
-#    define OLED_FONT_END 224
+#    define OLED_FONT_END 223
 #endif
 // Font render width
 #if !defined(OLED_FONT_WIDTH)
@@ -260,4 +260,4 @@ bool oled_scroll_off(void);
 uint8_t oled_max_chars(void);
 
 // Returns the maximum number of lines that will fit on the oled
-uint8_t oled_max_lines(void);
\ No newline at end of file
+uint8_t oled_max_lines(void);