diff --git a/source/blender/src/fluidsim.c b/source/blender/src/fluidsim.c
index a89c5e876f9..cb6519253b7 100644
--- a/source/blender/src/fluidsim.c
+++ b/source/blender/src/fluidsim.c
@@ -80,6 +80,7 @@
 #include "BSE_headerbuttons.h"
 
 #include "mydevice.h"
+#include "render.h" // for RE_make_existing_file
 
 #include "SDL.h"
 #include "SDL_thread.h"