diff --git a/meta-arm/conf/machine/microbit-v1.conf b/meta-arm/conf/machine/microbit-v1.conf
index c4cc4d50..b247d6ed 100644
--- a/meta-arm/conf/machine/microbit-v1.conf
+++ b/meta-arm/conf/machine/microbit-v1.conf
@@ -7,6 +7,9 @@ require conf/machine/include/tune-cortex-m0.inc
 
 MACHINEOVERRIDES =. "nordic:"
 
+# GLIBC will not work with Cortex-M.
+TCLIBC = "newlib"
+
 # For runqemu
 QB_SYSTEM_NAME = "qemu-system-arm"
 QB_MACHINE = "-machine microbit"