diff --git a/meta-openembedded/meta-initramfs/recipes-devtools/klibc/klibc.inc b/meta-openembedded/meta-initramfs/recipes-devtools/klibc/klibc.inc
index 5805448..7faf0ca 100644
--- a/meta-openembedded/meta-initramfs/recipes-devtools/klibc/klibc.inc
+++ b/meta-openembedded/meta-initramfs/recipes-devtools/klibc/klibc.inc
@@ -33,6 +33,9 @@
 
 S = "${WORKDIR}/git"
 
+OPTFLAGS = "${TUNE_CCARGS} -Os"
+OPTFLAGS_append_libc-musl_toolchain-clang = " -fno-builtin-bcmp"
+
 PARALLEL_MAKE = ""
 EXTRA_OEMAKE = "'KLIBCARCH=${KLIBC_ARCH}' \
                 'CROSS_COMPILE=${TARGET_PREFIX}' \
@@ -43,7 +46,7 @@
                 'INSTALLDIR=${libdir}/klibc' \
                 'SHLIBDIR=${libdir}' \
                 '${KLIBCTHUMB}' \
-                'KLIBCOPTFLAGS=${TUNE_CCARGS} -Os' \
+                'KLIBCOPTFLAGS=${OPTFLAGS}' \
                  V=1 \
                 "