diff --git a/extensions/st_dns.h b/extensions/st_dns.h
index be10886..3c56a98 100644
--- a/extensions/st_dns.h
+++ b/extensions/st_dns.h
@@ -2,4 +2,10 @@
 #include <arpa/inet.h>
 #include <netdb.h>
 
+#ifdef __cplusplus
+extern "C" {
+#endif
 extern int st_gethostbyname_r(const char *name, struct hostent **host);
+#ifdef __cplusplus
+}
+#endif