diff --git a/lib/nghttp2_helper.c b/lib/nghttp2_helper.c
index 9167ccbb..1a9f6a03 100644
--- a/lib/nghttp2_helper.c
+++ b/lib/nghttp2_helper.c
@@ -276,3 +276,8 @@ const char* nghttp2_strerror(int error_code)
     return "Unknown error code";
   }
 }
+
+void nghttp2_free(void *ptr)
+{
+  free(ptr);
+}
diff --git a/lib/nghttp2_helper.h b/lib/nghttp2_helper.h
index 8559a12a..61ebbc3b 100644
--- a/lib/nghttp2_helper.h
+++ b/lib/nghttp2_helper.h
@@ -133,4 +133,12 @@ int nghttp2_check_header_name(const uint8_t *name, size_t len);
  */
 int nghttp2_check_header_name_nocase(const uint8_t *name, size_t len);
 
+/*
+ * Deallocates memory space pointed by |ptr|. This function exists for
+ * the application to free the memory space allocated by the library
+ * functions. Currently this function is hidden from the public API,
+ * but may be exposed as public API.
+ */
+void nghttp2_free(void *ptr);
+
 #endif /* NGHTTP2_HELPER_H */