extern "C" used in skeletons

diff --git a/skeletons/ber_decoder.h b/skeletons/ber_decoder.h
index af8d8e3..fc25984 100644
--- a/skeletons/ber_decoder.h
+++ b/skeletons/ber_decoder.h
@@ -7,6 +7,10 @@
 
 #include <asn_application.h>
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 struct asn_TYPE_descriptor_s;	/* Forward declaration */
 struct asn_codec_ctx_s;		/* Forward declaration */
 
@@ -52,4 +56,8 @@
 		int *opt_tlv_form	/* optional tag form */
 	);
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif	/* _BER_DECODER_H_ */