diff --git a/examples/api/Makefile b/examples/api/Makefile
index dab6398..87c15d0 100644
--- a/examples/api/Makefile
+++ b/examples/api/Makefile
@@ -34,6 +34,7 @@
 EXT_COBJ-y += lib/string.o
 EXT_COBJ-y += lib/time.o
 EXT_COBJ-y += lib/vsprintf.o
+EXT_COBJ-y += lib/charset.o
 EXT_SOBJ-$(CONFIG_PPC) += arch/powerpc/lib/ppcstring.o
 ifeq ($(ARCH),arm)
 EXT_SOBJ-$(CONFIG_USE_ARCH_MEMSET) += arch/arm/lib/memset.o