diff --git a/include/mbedtls/config.h b/include/mbedtls/config.h
index 1aa86bf1b..3b7c85b39 100644
--- a/include/mbedtls/config.h
+++ b/include/mbedtls/config.h
@@ -2566,6 +2566,9 @@
 
 /* \} name SECTION: Customisation configuration options */
 
+/* Target and application specific configurations */
+//#define YOTTA_CFG_MBEDTLS_USER_CONFIG_FILE "target_config.h"
+
 /*
  * Allow user to override any previous default.
  *
diff --git a/yotta/data/adjust-config.sh b/yotta/data/adjust-config.sh
index 170d3070a..6580c0900 100755
--- a/yotta/data/adjust-config.sh
+++ b/yotta/data/adjust-config.sh
@@ -14,6 +14,10 @@ conf() {
     $SCRIPT -f $FILE $@
 }
 
+
+# Set the target specific header
+conf set YOTTA_CFG_MBEDTLS_USER_CONFIG_FILE \"target_config.h\"
+
 # not supported on mbed OS, nor used by mbed Client
 conf unset MBEDTLS_NET_C
 conf unset MBEDTLS_TIMING_C