diff --git a/components/TARGET_PSA/TARGET_TFM/COMPONENT_NSPE/interface/src/tfm_ns_lock_rtx.c b/components/TARGET_PSA/TARGET_TFM/COMPONENT_NSPE/interface/src/tfm_ns_lock_rtx.c
index 59ef1495a5..feece0be33 100644
--- a/components/TARGET_PSA/TARGET_TFM/COMPONENT_NSPE/interface/src/tfm_ns_lock_rtx.c
+++ b/components/TARGET_PSA/TARGET_TFM/COMPONENT_NSPE/interface/src/tfm_ns_lock_rtx.c
@@ -6,9 +6,9 @@
  */
 #include <stdint.h>
 #include <stdbool.h>
-
+#include "cmsis.h"
+#include "rtx_os.h"
 #include "cmsis_os2.h"
-
 #include "tfm_api.h"
 #include "tfm_ns_lock.h"
 
@@ -29,9 +29,14 @@ static struct ns_lock_state ns_lock = {.init=false, .id=NULL};
 /**
  * \brief Mutex properties, NS lock
  */
+
+static osRtxMutex_t ns_lock_cb = { 0 };
+
 static const osMutexAttr_t ns_lock_attrib = {
     .name = "ns_lock",
-    .attr_bits = osMutexPrioInherit
+    .attr_bits = osMutexPrioInherit,
+    .cb_mem = &ns_lock_cb,
+    .cb_size = sizeof(ns_lock_cb)
 };
 
 /**