diff --git a/Source/Core/Core/IOS/USB/Bluetooth/WiimoteDevice.cpp b/Source/Core/Core/IOS/USB/Bluetooth/WiimoteDevice.cpp
index 61767b75a2..76f0ee89c7 100644
--- a/Source/Core/Core/IOS/USB/Bluetooth/WiimoteDevice.cpp
+++ b/Source/Core/Core/IOS/USB/Bluetooth/WiimoteDevice.cpp
@@ -611,7 +611,7 @@ void WiimoteDevice::ReceiveConfigurationReq(u8 ident, u8* data, u32 size)
     break;
 
     default:
-      DEBUG_ASSERT_MSG(IOS_WIIMOTE, 0, "Unknown Option: {:#04x}", options->type);
+      DEBUG_ASSERT_MSG(IOS_WIIMOTE, 0, "Unknown Option: 0x%02x", options->type);
       break;
     }