diff --git a/platform/none/usbh_lwip.c b/platform/none/usbh_lwip.c
index ee526ed7..7b3f7c62 100644
--- a/platform/none/usbh_lwip.c
+++ b/platform/none/usbh_lwip.c
@@ -27,7 +27,7 @@
 #endif
 
 #if TCPIP_THREAD_STACKSIZE < 1024
-#error "TCPIP_THREAD_STACKSIZE must be >= 1024"
+#error TCPIP_THREAD_STACKSIZE must be >= 1024
 #endif
 
 // #define CONFIG_USBHOST_PLATFORM_CDC_ECM
diff --git a/platform/rtthread/usbh_lwip.c b/platform/rtthread/usbh_lwip.c
index 43970555..34dc3850 100644
--- a/platform/rtthread/usbh_lwip.c
+++ b/platform/rtthread/usbh_lwip.c
@@ -45,7 +45,7 @@
 #endif
 
 #if RT_LWIP_TCPTHREAD_STACKSIZE < 2048
-#error "RT_LWIP_TCPTHREAD_STACKSIZE must be >= 2048"
+#error RT_LWIP_TCPTHREAD_STACKSIZE must be >= 2048
 #endif
 
 // #define CONFIG_USBHOST_PLATFORM_CDC_ECM