diff --git a/cores/arduino/USB/samd21_device.c b/cores/arduino/USB/samd21_device.c
index 8ba091fe4b94d9ec243247893853bc5444ca1627..82342405f2a17b08e4c55b27d72b50ea441d786c 100644
--- a/cores/arduino/USB/samd21_device.c
+++ b/cores/arduino/USB/samd21_device.c
@@ -34,8 +34,8 @@ extern "C"{
 //#define TRACE_DEVICE(x)	x
 #define TRACE_DEVICE(x)
 
-__attribute__((__aligned__(4)))   __attribute__((__section__(".bss_hram0"))) uint8_t udd_ep_out_cache_buffer[4][64];
-__attribute__((__aligned__(4)))   __attribute__((__section__(".bss_hram0"))) uint8_t udd_ep_in_cache_buffer[4][128];
+__attribute__((__aligned__(4))) /*__attribute__((__section__(".bss_hram0")))*/ uint8_t udd_ep_out_cache_buffer[4][64];
+__attribute__((__aligned__(4))) /*__attribute__((__section__(".bss_hram0")))*/ uint8_t udd_ep_in_cache_buffer[4][128];
 
 /**
  * USB SRAM data containing pipe descriptor table