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-rw-r--r--components/gfx/platform/freetype/font_context.rs3
1 files changed, 2 insertions, 1 deletions
diff --git a/components/gfx/platform/freetype/font_context.rs b/components/gfx/platform/freetype/font_context.rs
index bbf5355efd9..ccd3d40a395 100644
--- a/components/gfx/platform/freetype/font_context.rs
+++ b/components/gfx/platform/freetype/font_context.rs
@@ -57,7 +57,8 @@ extern fn ft_realloc(mem: FT_Memory, _cur_size: c_long, new_req_size: c_long,
let new_actual_size = heap_size_of(new_ptr);
let user = (*mem).user as *mut User;
- (*user).size += new_actual_size - old_actual_size;
+ (*user).size += new_actual_size;
+ (*user).size -= old_actual_size;
new_ptr
}