diff --git a/arch/xtensa/Kconfig b/arch/xtensa/Kconfig
index b168f93ea1f..48ff80958e6 100644
--- a/arch/xtensa/Kconfig
+++ b/arch/xtensa/Kconfig
@@ -21,6 +21,7 @@ config ARCH_CHIP_ESP32
 	select ARCH_HAVE_TESTSET
 	select ARCH_HAVE_TEXT_HEAP
 	select ARCH_VECNOTIRQ
+	select LIBC_PREVENT_STRING_KERNEL
 	select LIBC_ARCH_ATOMIC
 	select LIBC_ARCH_MEMCPY if BUILD_FLAT
 	select LIBC_ARCH_MEMCHR if BUILD_FLAT
@@ -83,6 +84,7 @@ config ARCH_CHIP_ESP32S3
 	select ARCH_HAVE_RESET
 	select ARCH_HAVE_TESTSET
 	select ARCH_VECNOTIRQ
+	select LIBC_PREVENT_STRING_KERNEL
 	select LIBC_ARCH_MEMCPY if BUILD_FLAT
 	select LIBC_ARCH_MEMCHR if BUILD_FLAT
 	select LIBC_ARCH_MEMCMP if BUILD_FLAT