diff --git a/CMSIS/Core/Include/cmsis_iccarm.h b/CMSIS/Core/Include/cmsis_iccarm.h
index 7eeffca..58e8e36 100644
--- a/CMSIS/Core/Include/cmsis_iccarm.h
+++ b/CMSIS/Core/Include/cmsis_iccarm.h
@@ -7,8 +7,8 @@
 
 //------------------------------------------------------------------------------
 //
-// Copyright (c) 2017-2019 IAR Systems
-// Copyright (c) 2017-2019 Arm Limited. All rights reserved. 
+// Copyright (c) 2017-2020 IAR Systems
+// Copyright (c) 2017-2019 Arm Limited. All rights reserved.
 //
 // SPDX-License-Identifier: Apache-2.0
 //
@@ -238,6 +238,7 @@
   #endif
 #endif
 
+#undef __WEAK                           /* undo the definition from DLib_Defaults.h */
 #ifndef   __WEAK
   #if __ICCARM_V8
     #define __WEAK __attribute__((weak))