Fix ssd1306 compilation on avr-gcc 10 (#9267)

2 files changed, 3 insertions, 1 deletions

diff --git a/keyboards/yosino58/ssd1306.c b/keyboards/yosino58/ssd1306.c
index ff6ba210d..abd9de2f7 100644
--- a/keyboards/yosino58/ssd1306.c
+++ b/keyboards/yosino58/ssd1306.c
@@ -10,6 +10,8 @@
 #include "sendchar.h"
 #include "timer.h"
 
+struct CharacterMatrix display;
+
 extern const unsigned char font[] PROGMEM;
 
 // Set this to 1 to help diagnose early startup problems
diff --git a/keyboards/yosino58/ssd1306.h b/keyboards/yosino58/ssd1306.h
index acaf6217e..35e4c144c 100644
--- a/keyboards/yosino58/ssd1306.h
+++ b/keyboards/yosino58/ssd1306.h
@@ -70,7 +70,7 @@ struct CharacterMatrix {
   bool dirty;
 };
 
-struct CharacterMatrix display;
+extern struct CharacterMatrix display;
 
 bool iota_gfx_init(bool rotate);
 void iota_gfx_task(void);