diff --git a/src/header/malloc/cbindgen.toml b/src/header/malloc/cbindgen.toml
index 2d6db57254..18db86526d 100644
--- a/src/header/malloc/cbindgen.toml
+++ b/src/header/malloc/cbindgen.toml
@@ -1,12 +1,25 @@
 sys_includes = ["features.h", "stddef.h"]
 include_guard = "_RELIBC_MALLOC_H"
 trailer = """
+#ifndef _RELIBC_MALLOC_EXTRA_H
+#define _RELIBC_MALLOC_EXTRA_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 void *calloc(size_t nelem, size_t elsize);
 void free(void *ptr);
 void *malloc(size_t size);
 void *memalign(size_t alignment, size_t size);
 void *realloc(void *ptr, size_t size);
 void *valloc(size_t size);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
 """
 language = "C"
 style = "Type"