diff --git a/cmsis/TARGET_CORTEX_M/mbed_tz_context.c b/cmsis/TARGET_CORTEX_M/mbed_tz_context.c
index f315289..434422c 100644
--- a/cmsis/TARGET_CORTEX_M/mbed_tz_context.c
+++ b/cmsis/TARGET_CORTEX_M/mbed_tz_context.c
@@ -25,6 +25,8 @@
  *
  *---------------------------------------------------------------------------*/
  
+#if defined (__ARM_FEATURE_CMSE) &&  (__ARM_FEATURE_CMSE == 3U)
+
 #include "RTE_Components.h"
 #include CMSIS_device_header
 #include "tz_context.h"
@@ -201,3 +203,4 @@
 
   return 1U;    // Success
 }
+#endif