diff --git a/src/engine/runtime.js b/src/engine/runtime.js
index fbca1b714..25c4b71dc 100644
--- a/src/engine/runtime.js
+++ b/src/engine/runtime.js
@@ -1250,7 +1250,9 @@ class Runtime extends EventEmitter {
                     src: argInfo.dataURI,
                     // TODO these probably shouldn't be hardcoded...?
                     width: 24,
-                    height: 24
+                    height: 24,
+                    // TODO is false a good default here?
+                    flip_rtl: argInfo.flipRTL || false
                 };
             }
         } else {