diff --git a/core/embed/rust/rust_types.h b/core/embed/rust/rust_types.h
index fda46961cf..a1d4bcd28f 100644
--- a/core/embed/rust/rust_types.h
+++ b/core/embed/rust/rust_types.h
@@ -2,5 +2,5 @@
 
 // additional type for C-rust interface
 typedef struct {
-  uint8_t buf[1024];
+  uint8_t buf[2048];
 } c_layout_t;