diff --git a/src/common/workertypes.ts b/src/common/workertypes.ts
index a7c5b78e..ebe4c6b5 100644
--- a/src/common/workertypes.ts
+++ b/src/common/workertypes.ts
@@ -138,6 +138,7 @@ export interface WorkerUnchangedResult {
 export interface WorkerErrorResult {
   errors: WorkerError[]
   listings?: CodeListingMap
+  uppercaseOnly?: boolean
 }
 
 export interface WorkerOutputResult<T> {
@@ -147,6 +148,7 @@ export interface WorkerOutputResult<T> {
   params?: {}
   segments?: Segment[]
   debuginfo?: {} // optional info
+  uppercaseOnly?: boolean
   origin?: number
 }
 
diff --git a/src/ide/ui.ts b/src/ide/ui.ts
index 87d48429..ebe16df2 100644
--- a/src/ide/ui.ts
+++ b/src/ide/ui.ts
@@ -21,7 +21,7 @@ import { Toolbar } from "./toolbar";
 import { AssetEditorView } from "./views/asseteditor";
 import { isMobileDevice } from "./views/baseviews";
 import { AddressHeatMapView, BinaryFileView, MemoryMapView, MemoryView, ProbeLogView, ProbeSymbolView, RasterStackMapView, ScanlineIOView, VRAMMemoryView } from "./views/debugviews";
-import { DisassemblerView, ListingView, PC_LINE_LOOKAHEAD, SourceEditor } from "./views/editors";
+import { DisassemblerView, ListingView, PC_LINE_LOOKAHEAD, SourceEditor, setUppercaseOnly } from "./views/editors";
 import { CallStackView, DebugBrowserView } from "./views/treeviews";
 import { ProjectWindows } from "./windows";
 import Split = require('split.js');
@@ -908,6 +908,9 @@ function showExceptionAsError(err, msg: string) {
 }
 
 async function setCompileOutput(data: WorkerResult) {
+  if ('uppercaseOnly' in data) {
+    setUppercaseOnly(data.uppercaseOnly);
+  }
   // errors? mark them in editor
   if ('errors' in data && data.errors.length > 0) {
     toolbar.addClass("has-errors");
diff --git a/src/ide/views/editors.ts b/src/ide/views/editors.ts
index 01fb8c1b..fbbf39ca 100644
--- a/src/ide/views/editors.ts
+++ b/src/ide/views/editors.ts
@@ -60,6 +60,10 @@ export var textMapFunctions = {
   input: null as ((text: string) => string) | null
 };
 
+export function setUppercaseOnly(uppercaseOnly: boolean) {
+  textMapFunctions.input = uppercaseOnly ? (s) => s.toUpperCase() : null;
+}
+
 export class SourceEditor implements ProjectView {
   constructor(path: string, mode: string) {
     this.path = path;
diff --git a/src/platform/basic.ts b/src/platform/basic.ts
index c2180af3..476704d9 100644
--- a/src/platform/basic.ts
+++ b/src/platform/basic.ts
@@ -1,7 +1,6 @@
 
 import { Platform, BreakpointCallback, DebugCondition, DebugEvalCondition } from "../common/baseplatform";
 import { PLATFORMS, AnimationTimer, EmuHalt } from "../common/emu";
-import * as editors from "../ide/views/editors";
 import { BASICRuntime } from "../common/basic/runtime";
 import { BASICProgram } from "../common/basic/compiler";
 import { TeleTypeWithKeyboard } from "../common/teletype";
@@ -133,8 +132,6 @@ class BASICPlatform implements Platform {
         this.program = data;
         var resumePC = this.runtime.load(data);
         this.tty.uppercaseOnly = true; // this.program.opts.uppercaseOnly; //TODO?
-        // map editor to uppercase-only if need be
-        editors.textMapFunctions.input = this.program.opts.uppercaseOnly ? (s) => s.toUpperCase() : null;
         // only reset if we exited, or couldn't restart at label (PC reset to 0)
         if (!this.hotReload || didExit || !resumePC)
             this.reset();
diff --git a/src/worker/tools/misc.ts b/src/worker/tools/misc.ts
index 55fe3bba..c8e495bb 100644
--- a/src/worker/tools/misc.ts
+++ b/src/worker/tools/misc.ts
@@ -128,7 +128,7 @@ export function compileBASIC(step: BuildStep): WorkerResult {
             if (parser.errors.length == 0) throw e;
         }
         if (parser.errors.length) {
-            return { errors: parser.errors };
+            return { errors: parser.errors, uppercaseOnly: parser.opts.uppercaseOnly };
         }
         // put AST into JSON (sans source locations) to see if it has changed
         var json = JSON.stringify(ast, (key, value) => { return (key == '$loc' ? undefined : value) });
@@ -136,6 +136,7 @@ export function compileBASIC(step: BuildStep): WorkerResult {
         if (anyTargetChanged(step, [jsonpath])) return {
             output: ast,
             listings: parser.getListings(),
+            uppercaseOnly: parser.opts.uppercaseOnly,
         };
     }
 }