diff --git a/main.go b/main.go
index f24c79e..400f4e3 100644
--- a/main.go
+++ b/main.go
@@ -3,6 +3,7 @@ package main
 // #cgo LDFLAGS: -shared
 import "C"
 import (
+	"encoding/binary"
 	"encoding/json"
 	"fmt"
 	"time"
@@ -103,8 +104,8 @@ func Select() *C.char {
 		Initialized:            info.Initialized,
 		InstanceUID:            info.InstanceUID,
 		SecureChannelPublicKey: info.SecureChannelPublicKey,
-		Version:                info.Version,
-		AvailableSlots:         info.AvailableSlots,
+		Version:                bytesToInt(info.Version),
+		AvailableSlots:         bytesToInt(info.AvailableSlots),
 		KeyUID:                 info.KeyUID,
 		Capabilities:           Capability(info.Capabilities),
 	})
@@ -411,3 +412,13 @@ func ChangePairingPassword(jsonParams *C.char) *C.char {
 func SetSignalEventCallback(cb unsafe.Pointer) {
 	signal.SetSignalEventCallback(cb)
 }
+
+func bytesToInt(s []byte) int {
+	if len(s) > 4 {
+		return 0
+	}
+
+	var b [4]byte
+	copy(b[4-len(s):], s)
+	return int(binary.BigEndian.Uint32(b[:]))
+}
diff --git a/signal/events_keycard.go b/signal/events_keycard.go
index 3127046..c4dc70a 100644
--- a/signal/events_keycard.go
+++ b/signal/events_keycard.go
@@ -1,7 +1,6 @@
 package signal
 
 const (
-	// EventSignRequestAdded is triggered when send transaction request is queued
 	EventKeycardConnected = "keycard.connected"
 )
 
diff --git a/types.go b/types.go
index cfd69f0..1a49eee 100644
--- a/types.go
+++ b/types.go
@@ -93,8 +93,8 @@ type ApplicationInfo struct {
 	Initialized            bool      `json:"initialized"`
 	InstanceUID            hexString `json:"instanceUID"`
 	SecureChannelPublicKey hexString `json:"secureChannelPublicKey"`
-	Version                hexString `json:"version"`
-	AvailableSlots         hexString `json:"availableSlots"`
+	Version                int       `json:"version"`
+	AvailableSlots         int       `json:"availableSlots"`
 	// KeyUID is the sha256 of of the master public key on the card.
 	// It's empty if the card doesn't contain any key.
 	KeyUID       hexString  `json:"keyUID"`