diff --git a/shared-module/lvfontio/OnDiskFont.c b/shared-module/lvfontio/OnDiskFont.c
index 0cf65301d2270..368bd381475b1 100644
--- a/shared-module/lvfontio/OnDiskFont.c
+++ b/shared-module/lvfontio/OnDiskFont.c
@@ -253,9 +253,10 @@ static bool load_font_header(lvfontio_ondiskfont_t *self, FIL *file, size_t *max
                         *max_slots = advance_count[1] * 2 + advance_count[0];
                     }
                 }
+            } else {
+                *max_slots = advance_count[0] + advance_count[1];
             }
 
-
             found_glyf = true;
         }