diff --git a/firmware/messages.c b/firmware/messages.c
index 6db0d54db..d290da779 100644
--- a/firmware/messages.c
+++ b/firmware/messages.c
@@ -314,7 +314,16 @@ const uint8_t *msg_debug_out_data(void)
 
 #endif
 
-CONFIDENTIAL uint8_t msg_tiny[64];
+CONFIDENTIAL uint8_t msg_tiny[128];
+_Static_assert(sizeof(msg_tiny) >= sizeof(Cancel), "msg_tiny too tiny");
+_Static_assert(sizeof(msg_tiny) >= sizeof(Initialize), "msg_tiny too tiny");
+_Static_assert(sizeof(msg_tiny) >= sizeof(PassphraseAck), "msg_tiny too tiny");
+_Static_assert(sizeof(msg_tiny) >= sizeof(ButtonAck), "msg_tiny too tiny");
+_Static_assert(sizeof(msg_tiny) >= sizeof(PinMatrixAck), "msg_tiny too tiny");
+#if DEBUG_LINK
+_Static_assert(sizeof(msg_tiny) >= sizeof(DebugLinkDecision), "msg_tiny too tiny");
+_Static_assert(sizeof(msg_tiny) >= sizeof(DebugLinkGetState), "msg_tiny too tiny");
+#endif
 uint16_t msg_tiny_id = 0xFFFF;
 
 void msg_read_tiny(const uint8_t *buf, int len)
diff --git a/firmware/messages.h b/firmware/messages.h
index e0a5c8b6f..ace4a4448 100644
--- a/firmware/messages.h
+++ b/firmware/messages.h
@@ -47,7 +47,7 @@ bool msg_write_common(char type, uint16_t msg_id, const void *msg_ptr);
 
 void msg_read_tiny(const uint8_t *buf, int len);
 void msg_debug_read_tiny(const uint8_t *buf, int len);
-extern uint8_t msg_tiny[64];
+extern uint8_t msg_tiny[128];
 extern uint16_t msg_tiny_id;
 
 #endif