extern "C" used in skeletons

diff --git a/skeletons/UTF8String.h b/skeletons/UTF8String.h
index 84e6eaf..3bc8ea6 100644
--- a/skeletons/UTF8String.h
+++ b/skeletons/UTF8String.h
@@ -7,6 +7,10 @@
 
 #include <OCTET_STRING.h>
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 typedef OCTET_STRING_t UTF8String_t;	/* Implemented via OCTET STRING */
 
 extern asn_TYPE_descriptor_t asn_DEF_UTF8String;
@@ -38,4 +42,8 @@
  */
 size_t UTF8String_to_wcs(const UTF8String_t *st, uint32_t *dst, size_t dstlen);
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif	/* _UTF8String_H_ */