diff --git a/libraries/USBDevice/USBDevice/USBHAL.h b/libraries/USBDevice/USBDevice/USBHAL.h
index c9c047e3b2b..a6464ab7f6f 100644
--- a/libraries/USBDevice/USBDevice/USBHAL.h
+++ b/libraries/USBDevice/USBDevice/USBHAL.h
@@ -22,6 +22,10 @@
 #include "mbed.h"
 #include "USBEndpoints.h"
 
+#ifdef __GNUC__
+#define __packed __attribute__ ((__packed__))
+#endif
+
 class USBHAL {
 public:
     /* Configuration */
diff --git a/libraries/mbed/capi/toolchain.h b/libraries/mbed/capi/toolchain.h
index 69a4ddd87b7..bb83e169c33 100644
--- a/libraries/mbed/capi/toolchain.h
+++ b/libraries/mbed/capi/toolchain.h
@@ -32,4 +32,9 @@ typedef int FILEHANDLE;
 #   define PACKED   __attribute__((packed))
 #endif
 
+
+#ifdef __GNUC__
+#define __packed __attribute__ ((__packed__))
+#endif
+
 #endif
diff --git a/libraries/mbed/cpp/mbed.h b/libraries/mbed/cpp/mbed.h
index bba24a76dbe..e82fd970a45 100644
--- a/libraries/mbed/cpp/mbed.h
+++ b/libraries/mbed/cpp/mbed.h
@@ -18,6 +18,7 @@
 
 #define MBED_LIBRARY_VERSION 30
 
+#include "toolchain.h"
 #include "platform.h"
 
 // Useful C libraries