diff --git a/arch/arc/core/fatal.c b/arch/arc/core/fatal.c
index 791a45d17e2..8195bc06e6d 100644
--- a/arch/arc/core/fatal.c
+++ b/arch/arc/core/fatal.c
@@ -84,12 +84,6 @@ FUNC_NORETURN void _NanoFatalErrorHandler(unsigned int reason,
 		break;
 #endif
 
-#ifdef CONFIG_ENHANCED_SECURITY
-	case _NANO_ERR_INVALID_STRING_OP:
-		PR_EXC("**** Invalid string operation! ****\n");
-		break;
-#endif
-
 	default:
 		PR_EXC("**** Unknown Fatal Error %d! ****\n", reason);
 		break;
diff --git a/arch/arm/core/nanofatal.c b/arch/arm/core/nanofatal.c
index a6ac8d1e3db..5b44b76ae6a 100644
--- a/arch/arm/core/nanofatal.c
+++ b/arch/arm/core/nanofatal.c
@@ -102,12 +102,6 @@ FUNC_NORETURN void _NanoFatalErrorHandler(
 		break;
 #endif /* CONFIG_STACK_CANARIES */
 
-#ifdef CONFIG_ENHANCED_SECURITY
-	case _NANO_ERR_INVALID_STRING_OP:
-		PR_EXC("**** Invalid string operation! ****\n");
-		break;
-#endif /* CONFIG_ENHANCED_SECURITY */
-
 	default:
 		PR_EXC("**** Unknown Fatal Error %d! ****\n", reason);
 		break;
diff --git a/arch/x86/core/nanofatal.c b/arch/x86/core/nanofatal.c
index d53bb11536e..be870a9ebae 100644
--- a/arch/x86/core/nanofatal.c
+++ b/arch/x86/core/nanofatal.c
@@ -114,12 +114,6 @@ FUNC_NORETURN void _NanoFatalErrorHandler(
 #endif /* CONFIG_STACK_CANARIES */
 
 
-#ifdef CONFIG_ENHANCED_SECURITY
-	case _NANO_ERR_INVALID_STRING_OP:
-		printk("**** Invalid string operation! ****\n");
-		break;
-#endif /* CONFIG_ENHANCED_SECURITY */
-
 	default:
 		printk("**** Unknown Fatal Error %d! ****\n", reason);
 		break;
diff --git a/include/arch/arc/v2/error.h b/include/arch/arc/v2/error.h
index b7265c8ec58..71ddcb88e0c 100644
--- a/include/arch/arc/v2/error.h
+++ b/include/arch/arc/v2/error.h
@@ -49,6 +49,5 @@ extern void _SysFatalErrorHandler(unsigned int cause, const NANO_ESF *esf);
 #define _NANO_ERR_HW_EXCEPTION (0)      /* MPU/Bus/Usage fault */
 #define _NANO_ERR_INVALID_TASK_EXIT (1) /* Invalid task exit */
 #define _NANO_ERR_STACK_CHK_FAIL (2)    /* Stack corruption detected */
-#define _NANO_ERR_INVALID_STRING_OP (3) /* Invalid string operation */
 
 #endif /* _ARCH_ARC_V2_ERROR_H_ */
diff --git a/include/arch/arm/CortexM/error.h b/include/arch/arm/CortexM/error.h
index d79743ea870..84055458775 100644
--- a/include/arch/arm/CortexM/error.h
+++ b/include/arch/arm/CortexM/error.h
@@ -49,6 +49,5 @@ extern void _SysFatalErrorHandler(unsigned int, const NANO_ESF *);
 #define _NANO_ERR_HW_EXCEPTION (0)      /* MPU/Bus/Usage fault */
 #define _NANO_ERR_INVALID_TASK_EXIT (1) /* Invalid task exit */
 #define _NANO_ERR_STACK_CHK_FAIL (2)    /* Stack corruption detected */
-#define _NANO_ERR_INVALID_STRING_OP (3) /* Invalid string operation */
 
 #endif /* _ARCH_ARM_CORTEXM_ERROR_H_ */
diff --git a/include/arch/x86/arch.h b/include/arch/x86/arch.h
index 89a4715468f..a61c64c5879 100644
--- a/include/arch/x86/arch.h
+++ b/include/arch/x86/arch.h
@@ -196,7 +196,6 @@ typedef struct nanoIsf {
 #define _NANO_ERR_GEN_PROT_FAULT	 (2)	/* General protection fault */
 #define _NANO_ERR_INVALID_TASK_EXIT  (3)	/* Invalid task exit */
 #define _NANO_ERR_STACK_CHK_FAIL	 (4)	/* Stack corruption detected */
-#define _NANO_ERR_INVALID_STRING_OP  (5)	/* Invalid string operation */
 
 #ifndef _ASMLANGUAGE