diff --git a/src/engine/runtime.js b/src/engine/runtime.js
index 6fc794268f7..448bf8e1ea1 100644
--- a/src/engine/runtime.js
+++ b/src/engine/runtime.js
@@ -1414,6 +1414,11 @@ class Runtime extends EventEmitter {
                 blockJSON.nextStatement = null; // null = available connection; undefined = terminal
             }
             break;
+        case BlockType.INLINE:
+            blockInfo.branchCount = blockInfo.branchCount || 1;
+            blockJSON.output = blockInfo.allowDropAnywhere ? null : 'String'; // TODO: distinguish number & string here?
+            blockJSON.outputShape = ScratchBlocksConstants.OUTPUT_SHAPE_SQUARE;
+            break;
         }
 
         const blockText = Array.isArray(blockInfo.text) ? blockInfo.text : [blockInfo.text];