diff --git a/source/blender/render/intern/source/pipeline.c b/source/blender/render/intern/source/pipeline.c
index f585912c18c..604ba189dcf 100644
--- a/source/blender/render/intern/source/pipeline.c
+++ b/source/blender/render/intern/source/pipeline.c
@@ -1894,6 +1894,7 @@ static void validate_render_settings(Render *re)
 	if(RE_engine_is_external(re)) {
 		/* not supported yet */
 		re->r.scemode &= ~(R_EXR_TILE_FILE|R_FULL_SAMPLE);
+		re->r.mode &= ~R_FIELDS;
 	}
 }