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 ef6cfe0f92..76b284efff 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
@@ -8,6 +8,7 @@
 #include <stdbool.h>
 
 #include "cmsis.h"
+#include "rtx_os.h"
 #include "cmsis_os2.h"
 
 #include "tfm_api.h"
@@ -30,9 +31,14 @@ 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)
 };
 
 /**