diff --git a/include/msvcrt/errno.h b/include/msvcrt/errno.h
index d37b7ce754f..2a5194e4d7b 100644
--- a/include/msvcrt/errno.h
+++ b/include/msvcrt/errno.h
@@ -112,8 +112,16 @@
 
 #endif /* USE_MSVCRT_PREFIX */
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 extern int* MSVCRT(_errno)(void);
 
+#ifdef __cplusplus
+}
+#endif
+
 #ifndef USE_MSVCRT_PREFIX
 # define errno        (*_errno())
 #else