diff --git a/tests/visual_tests/test.py b/tests/visual_tests/test.py
index b06efb96e..1b07dac6e 100755
--- a/tests/visual_tests/test.py
+++ b/tests/visual_tests/test.py
@@ -272,6 +272,7 @@ files = {
     'marker-whole-multi-polygon':{'sizes':[(512,512)]},
     'shield-on-line-and-avoid-edges':{'sizes':[(512,512)]},
     'text-typographic':{'sizes':[(512,512)]},
+    'functional-expressions':{'sizes':[(256,256)], 'bbox':mapnik.Box2d(-10,-10,10,10)},
     }
 
 class Reporting: