diff --git a/targets/TARGET_NUVOTON/TARGET_M480/device/StdDriver/m480_hsusbd.c b/targets/TARGET_NUVOTON/TARGET_M480/device/StdDriver/m480_hsusbd.c
index 1a6920c2d7..22ea97a329 100644
--- a/targets/TARGET_NUVOTON/TARGET_M480/device/StdDriver/m480_hsusbd.c
+++ b/targets/TARGET_NUVOTON/TARGET_M480/device/StdDriver/m480_hsusbd.c
@@ -41,8 +41,10 @@ static uint8_t g_hsusbd_TestSelector = 0ul;
 #ifdef __ICCARM__
 #pragma data_alignment=4
 static uint8_t g_hsusbd_buf[12];
-#else
+#elif defined (__CC_ARM)
 __align(4) static uint8_t g_hsusbd_buf[12];
+#elif defined ( __GNUC__ )
+static uint8_t g_hsusbd_buf[12] __attribute__((aligned (4)));
 #endif
 
 uint8_t g_hsusbd_Configured = 0ul;
diff --git a/targets/TARGET_NUVOTON/TARGET_M480/device/StdDriver/m480_sdh.c b/targets/TARGET_NUVOTON/TARGET_M480/device/StdDriver/m480_sdh.c
index 7d39cedfca..f09b782a1e 100644
--- a/targets/TARGET_NUVOTON/TARGET_M480/device/StdDriver/m480_sdh.c
+++ b/targets/TARGET_NUVOTON/TARGET_M480/device/StdDriver/m480_sdh.c
@@ -45,6 +45,8 @@ __align(4) uint8_t _SDH_ucSDHCBuffer[512];
 #elif defined ( __ICCARM__ ) /*!< IAR Compiler */
 #pragma data_alignment = 4
 uint8_t _SDH_ucSDHCBuffer[512];
+#elif defined ( __GNUC__ )
+uint8_t _SDH_ucSDHCBuffer[512] __attribute__((aligned (4)));
 #endif
 
 int SDH_ok = 0;