diff --git a/h_malloc.h b/h_malloc.h
index 697f33e..83879f0 100644
--- a/h_malloc.h
+++ b/h_malloc.h
@@ -5,6 +5,8 @@
 
 #include <malloc.h>
 
+__BEGIN_DECLS
+
 #ifndef H_MALLOC_PREFIX
 #define h_malloc malloc
 #define h_calloc calloc
@@ -103,4 +105,6 @@ size_t h_malloc_object_size_fast(void *ptr);
 // passed size matches the allocated size.
 void h_free_sized(void *ptr, size_t expected_size);
 
+__END_DECLS
+
 #endif