diff --git a/libraries/AP_HAL/Util.h b/libraries/AP_HAL/Util.h
index b605fecabad95..d5bd6bb95cf4e 100644
--- a/libraries/AP_HAL/Util.h
+++ b/libraries/AP_HAL/Util.h
@@ -147,7 +147,8 @@ class AP_HAL::Util {
     // allocate and free DMA-capable memory if possible. Otherwise return normal memory
     enum Memory_Type {
         MEM_DMA_SAFE,
-        MEM_FAST
+        MEM_FAST,
+        MEM_FILESYSTEM
     };
     virtual void *malloc_type(size_t size, Memory_Type mem_type) { return calloc(1, size); }
     virtual void free_type(void *ptr, size_t size, Memory_Type mem_type) { return free(ptr); }