diff --git a/minui/font_10x18.h b/minui/font_10x18.h
index 7f96465c..29d70534 100644
--- a/minui/font_10x18.h
+++ b/minui/font_10x18.h
@@ -3,7 +3,7 @@ struct {
   unsigned height;
   unsigned cwidth;
   unsigned cheight;
-  unsigned char rundata[];
+  unsigned char rundata[2973];
 } font = {
   .width = 960,
   .height = 18,