diff --git a/firmware/fsm.c b/firmware/fsm.c
index 1d756f20b3..332733d5a5 100644
--- a/firmware/fsm.c
+++ b/firmware/fsm.c
@@ -795,8 +795,8 @@ void fsm_msgDecryptMessage(DecryptMessage *msg)
 	if (display_only) {
 		resp->has_address = false;
 		resp->has_message = false;
-		memset(resp->address, sizeof(resp->address), 0);
-		memset(&(resp->message), sizeof(resp->message), 0);
+		memset(resp->address, 0, sizeof(resp->address));
+		memset(&(resp->message), 0, sizeof(resp->message));
 	} else {
 		resp->has_address = signing;
 		resp->has_message = true;