diff --git a/src/apps/http/fs.c b/src/apps/http/fs.c
index c5af0769..e12e314e 100644
--- a/src/apps/http/fs.c
+++ b/src/apps/http/fs.c
@@ -38,20 +38,6 @@
 
 #include HTTPD_FSDATA_FILE
 
-/*-----------------------------------------------------------------------------------*/
-
-#if LWIP_HTTPD_CUSTOM_FILES
-int fs_open_custom(struct fs_file *file, const char *name);
-void fs_close_custom(struct fs_file *file);
-#if LWIP_HTTPD_FS_ASYNC_READ
-u8_t fs_canread_custom(struct fs_file *file);
-u8_t fs_wait_read_custom(struct fs_file *file, fs_wait_cb callback_fn, void *callback_arg);
-int fs_read_async_custom(struct fs_file *file, char *buffer, int count, fs_wait_cb callback_fn, void *callback_arg);
-#else /* LWIP_HTTPD_FS_ASYNC_READ */
-int fs_read_custom(struct fs_file *file, char *buffer, int count);
-#endif /* LWIP_HTTPD_FS_ASYNC_READ */
-#endif /* LWIP_HTTPD_CUSTOM_FILES */
-
 /*-----------------------------------------------------------------------------------*/
 err_t
 fs_open(struct fs_file *file, const char *name)
diff --git a/src/include/lwip/apps/fs.h b/src/include/lwip/apps/fs.h
index 5aa7d18f..82b219a9 100644
--- a/src/include/lwip/apps/fs.h
+++ b/src/include/lwip/apps/fs.h
@@ -119,6 +119,19 @@ struct fsdata_file {
 #endif /* HTTPD_PRECALCULATED_CHECKSUM */
 };
 
+#if LWIP_HTTPD_CUSTOM_FILES
+/* Prototypes required to implement custom files as fs addon */
+int fs_open_custom(struct fs_file *file, const char *name);
+void fs_close_custom(struct fs_file *file);
+#if LWIP_HTTPD_FS_ASYNC_READ
+u8_t fs_canread_custom(struct fs_file *file);
+u8_t fs_wait_read_custom(struct fs_file *file, fs_wait_cb callback_fn, void *callback_arg);
+int fs_read_async_custom(struct fs_file *file, char *buffer, int count, fs_wait_cb callback_fn, void *callback_arg);
+#else /* LWIP_HTTPD_FS_ASYNC_READ */
+int fs_read_custom(struct fs_file *file, char *buffer, int count);
+#endif /* LWIP_HTTPD_FS_ASYNC_READ */
+#endif /* LWIP_HTTPD_CUSTOM_FILES */
+
 #ifdef __cplusplus
 }
 #endif