diff --git a/os_port.c b/os_port.c
index dc634d1..773be45 100644
--- a/os_port.c
+++ b/os_port.c
@@ -188,6 +188,13 @@ void HardFault_Handler_C(ContextStateFrame_t* frame, uint32_t lr_value){
     uint32_t dfsr = SCB->DFSR;
     uint32_t afsr = SCB->AFSR;
 
+    OS_UNUSED(bus_fault_address);
+    OS_UNUSED(mem_manage_fault_address);
+    OS_UNUSED(cfsr);
+    OS_UNUSED(hfsr);
+    OS_UNUSED(dfsr);
+    OS_UNUSED(afsr);
+
 #if defined(AUTO_REBOOT_ENABLE)
     const uint32_t usage_fault_mask = 0xffff0000;
     const bool non_usage_fault_occurred =