diff --git a/src/passkey_child/passkey_child_credentials.c b/src/passkey_child/passkey_child_credentials.c
index b1666923f3..2949d0c061 100644
--- a/src/passkey_child/passkey_child_credentials.c
+++ b/src/passkey_child/passkey_child_credentials.c
@@ -35,7 +35,7 @@
 
 #include "passkey_child.h"
 
-#define IN_BUF_SIZE 512
+#define IN_BUF_SIZE 1024
 
 errno_t
 prepare_credentials(struct passkey_data *data, fido_dev_t *dev,
diff --git a/src/util/child_common.h b/src/util/child_common.h
index ec7eb3fca4..aa13e17fd1 100644
--- a/src/util/child_common.h
+++ b/src/util/child_common.h
@@ -32,8 +32,8 @@
 
 #include "util/util.h"
 
-#define IN_BUF_SIZE         512
-#define CHILD_MSG_CHUNK     256
+#define IN_BUF_SIZE         2048
+#define CHILD_MSG_CHUNK     1024
 
 #define SIGTERM_TO_SIGKILL_TIME 2