diff --git a/rtos/TARGET_CORTEX/mbed_rtos_rtx.c b/rtos/TARGET_CORTEX/mbed_rtos_rtx.c
index d36ceffa14..39f02787c7 100644
--- a/rtos/TARGET_CORTEX/mbed_rtos_rtx.c
+++ b/rtos/TARGET_CORTEX/mbed_rtos_rtx.c
@@ -91,8 +91,8 @@ MBED_NORETURN void mbed_rtos_start()
 
 #if defined(COMPONENT_SPE)
     // At this point, the mailbox is already initialized
-    spm_hal_start_nspe();
     psa_spm_init();
+    spm_hal_start_nspe();
 #endif // defined(COMPONENT_SPE)
 
 #if defined(COMPONENT_NSPE) && defined(COMPONENT_SPM_MAILBOX)